| addax | (noun) large antelope with lightly spiraled horns of desert regions of northern Africa | Synonyms: Addax nasomaculatus |
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| admix | (verb) mix or mingle | - |
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| affix | (noun) a linguistic element added to a word to produce an inflected or derived form | - |
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| (verb) stick or fasten to | Synonyms: stick on |
| (verb) add to the very end | Synonyms: add on, append, supplement |
| (verb) attach or become attached to a stem word | - |
| annex | (noun) an addition that extends a main building | Synonyms: annexe, extension, wing |
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| (verb) add an extra part to | - |
| (verb) take (territory) as if by conquest | - |
| anomalopteryx | (noun) the smallest moa; slender moa about the size of a large turkey | Synonyms: Anomalopteryx oweni |
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| antapex | (noun) the point opposite in direction from the solar apex; the point the solar system is moving away from | - |
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| antefix | (noun) carved ornament at the eaves of a tile roof concealing the joints between tiles | - |
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| anthrax | (noun) a highly infectious animal disease (especially cattle and sheep); it can be transmitted to people | Synonyms: splenic fever |
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| (noun) a disease of humans that is not communicable; caused by infection with Bacillus anthracis followed by septicemia | - |
| anticlimax | (noun) a change from a serious subject to a disappointing one | Synonyms: bathos |
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| (noun) a disappointing decline after a previous rise | - |
| apex | (noun) the highest point (of something) | Synonyms: acme, peak, vertex |
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| (noun) the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars | Synonyms: apex of the sun's way, solar apex |
| appendix | (noun) a vestigial process that extends from the lower end of the cecum and that resembles a small pouch | Synonyms: cecal appendage, vermiform appendix, vermiform process |
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| (noun) supplementary material that is collected and appended at the back of a book | - |
| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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| ax | (noun) an edge tool with a heavy bladed head mounted across a handle | Synonyms: axe |
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| (verb) terminate | Synonyms: axe |
| (verb) chop or split with an ax | Synonyms: axe |
| bandbox | (noun) a light cylindrical box for holding light articles of attire (especially hats) | - |
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| beeswax | (noun) a yellow to brown wax secreted by honeybees to build honeycombs | - |
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| (verb) cover with beeswax | - |
| biconvex | (adjective) convex on both sides; shaped like a lentil | Synonyms: convexo-convex, lenticular, lentiform |
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| bollix | (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, flub, fluff, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
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| borax | (noun) an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent | - |
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| box | (noun) a blow with the hand (usually on the ear) | - |
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| (noun) a (usually rectangular) container; may have a lid | - |
| (noun) separate partitioned area in a public place for a few people | - |
| (noun) private area in a theater or grandstand where a small group can watch the performance | Synonyms: loge |
| (noun) the driver's seat on a coach | Synonyms: box seat |
| (noun) any one of several designated areas on a ball field where the batter or catcher or coaches are positioned | - |
| (noun) evergreen shrubs or small trees | Synonyms: boxwood |
| (noun) the quantity contained in a box | Synonyms: boxful |
| (noun) a rectangular drawing | - |
| (noun) a predicament from which a skillful or graceful escape is impossible | Synonyms: corner |
| (verb) hit with the fist | - |
| (verb) engage in a boxing match | - |
| (verb) put into a box | Synonyms: package |
| breadbox | (noun) a container used to keep bread or cake in | Synonyms: bread-bin |
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| breakax | (noun) West Indian timber tree having very hard wood | Synonyms: break-axe, breakaxe, Sloanea jamaicensis |
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| broadax | (noun) a large ax with a broad cutting blade | Synonyms: broadaxe |
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| calx | (noun) a white crystalline oxide used in the production of calcium hydroxide | Synonyms: burnt lime, calcined lime, calcium oxide, fluxing lime, lime, quicklime, unslaked lime |
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| calyx | (noun) (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green | - |
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| camelpox | (noun) a viral disease of camels closely related to smallpox | - |
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| cashbox | (noun) a strongbox for holding cash | Synonyms: money box, till |
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| caudex | (noun) woody stem of palms and tree ferns | - |
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| (noun) persistent thickened stem of a herbaceous perennial plant | Synonyms: stock |
| centrex | (noun) (CENTRal EXchange) a kind of telephone exchange | - |
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| cervix | (noun) the part of an organism (human or animal) that connects the head to the rest of the body | Synonyms: neck |
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| (noun) necklike opening to the uterus | Synonyms: cervix uteri, uterine cervix |
| chatterbox | (noun) an obnoxious and foolish and loquacious talker | Synonyms: babbler, chatterer, magpie, prater, spouter |
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| (noun) orchid growing along streams or ponds of western North America having leafy stems and 1 greenish-brown and pinkish flower in the axil of each upper leaf | Synonyms: Epipactis gigantea, giant helleborine, stream orchid |
| chickenpox | (noun) an acute contagious disease caused by herpes varicella zoster virus; causes a rash of vesicles on the face and body | Synonyms: varicella |
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| cicatrix | (noun) a mark left (usually on the skin) by the healing of injured tissue | Synonyms: cicatrice, scar |
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| circumflex | (noun) a diacritical mark (^) placed above a vowel in some languages to indicate a special phonetic quality | - |
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| climax | (noun) the moment of most intense pleasure in sexual intercourse | Synonyms: coming, orgasm, sexual climax |
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| (noun) the decisive moment in a novel or play | Synonyms: culmination |
| (noun) arrangement of clauses in ascending order of forcefulness | - |
| (noun) the highest point of anything conceived of as growing or developing or unfolding | Synonyms: flood tide |
| (noun) the most severe stage of a disease | - |
| (verb) end, especially to reach a final or climactic stage | Synonyms: culminate |
| clx | (adjective) being ten more than one hundred fifty | Synonyms: 160, one hundred sixty |
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| clxx | (adjective) being ten more than one hundred sixty | Synonyms: 170, one hundred seventy |
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| clxxx | (adjective) being ten more than one hundred seventy | Synonyms: 180, one hundred eighty |
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| coax | (noun) a transmission line for high-frequency signals | Synonyms: coax cable, coaxial cable |
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| (verb) influence or urge by gentle urging, caressing, or flattering | Synonyms: blarney, cajole, inveigle, palaver, sweet-talk, wheedle |
| coccyx | (noun) the end of the vertebral column in humans and tailless apes | Synonyms: tail bone |
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| codex | (noun) an unbound manuscript of some ancient classic (as distinguished from a scroll) | Synonyms: leaf-book |
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| (noun) an official list of chemicals or medicines etc. | - |
| commix | (verb) to bring or combine together or with something else | Synonyms: amalgamate, mingle, mix, unify |
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| complex | (adjective) complicated in structure; consisting of interconnected parts | - |
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| (adjective) difficult to analyze or understand | Synonyms: complicated |
| (noun) a whole structure (as a building) made up of interconnected or related structures | Synonyms: building complex |
| (noun) a conceptual whole made up of complicated and related parts | Synonyms: composite |
| (noun) (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior | - |
| (noun) a compound described in terms of the central atom to which other atoms are bound or coordinated | Synonyms: coordination compound |
| conflux | (noun) a flowing together | Synonyms: confluence, merging |
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| convex | (adjective) curving or bulging outward | Synonyms: bulging |
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| cortex | (noun) the tissue forming the outer layer of an organ or structure in plant or animal | - |
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| (noun) the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum | Synonyms: cerebral cortex, cerebral mantle, pallium |
| (noun) the tissue that surrounds the lens nucleus | Synonyms: lens cortex |
| cowpox | (noun) a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox | Synonyms: vaccinia |
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| cox | (noun) the helmsman of a ship's boat or a racing crew | Synonyms: coxswain |
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| (verb) act as the coxswain, in a boat race | - |
| crucifix | (noun) a gymnastic exercise performed on the rings when the gymnast supports himself with both arms extended horizontally | - |
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| (noun) representation of the cross on which Jesus died | Synonyms: rood-tree, rood |
| crux | (noun) the most important point | Synonyms: crux of the matter |
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| cx | (adjective) being ten more than one hundred | Synonyms: 110, one hundred ten |
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| cxx | (adjective) being ten more than one hundred ten | Synonyms: 120, one hundred twenty |
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| cxxx | (adjective) being ten more than one hundred twenty | Synonyms: 130, one hundred thirty |
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| cybersex | (noun) sexual arousal involving communication on the internet | - |
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| cylix | (noun) a shallow drinking cup with two handles; used in ancient Greece | Synonyms: kylix |
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| deedbox | (noun) a strongly made box for holding money or valuables; can be locked | Synonyms: strongbox |
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| desex | (verb) make infertile | Synonyms: desexualise, desexualize, fix, sterilise, sterilize, unsex |
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| detox | (noun) the hospital ward or clinic in which patients are detoxified | - |
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| (verb) treat for alcohol or drug dependence | Synonyms: detoxify |
| dominatrix | (noun) a dominating woman (especially one who plays that role in a sadomasochistic sexual relationship) | - |
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| duplex | (adjective) allowing communication in opposite directions simultaneously | - |
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| (adjective) (used technically of a device or process) having two parts | - |
| (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| (verb) change into a duplex | - |
| earwax | (noun) a soft yellow wax secreted by glands in the ear canal | Synonyms: cerumen |
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| efflux | (noun) the process of flowing out | Synonyms: effluence, outflow |
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| epicalyx | (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calycle, calyculus, false calyx |
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| equinox | (noun) (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic | Synonyms: equinoctial point |
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| (noun) either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length | - |
| ex | (adjective) out of fashion | Synonyms: antique, demode, old-fashioned, old-hat, outmoded, passe, passee |
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| (noun) the 24th letter of the Roman alphabet | Synonyms: X, x |
| (noun) a woman who was formerly a particular man's wife | Synonyms: ex-wife |
| (noun) a man who was formerly a certain woman's husband | Synonyms: ex-husband |
| executrix | (noun) a woman executor | - |
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| faux | (adjective) not genuine or real; being an imitation of the genuine article | Synonyms: fake, false, imitation, simulated |
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| fax | (noun) duplicator that transmits the copy by wire or radio | Synonyms: facsimile, facsimile machine |
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| (verb) send something via a facsimile machine | Synonyms: facsimile, telefax |
| firebox | (noun) a furnace (as on a steam locomotive) in which fuel is burned | - |
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| fix | (noun) the act of putting something in working order again | Synonyms: fixing, fixture, mend, mending, repair, reparation |
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| (noun) an exemption granted after influence (e.g., money) is brought to bear | - |
| (noun) a determination of the place where something is | Synonyms: localisation, localization, locating, location |
| (noun) something craved, especially an intravenous injection of a narcotic drug | - |
| (noun) informal terms for a difficult situation | Synonyms: hole, jam, kettle of fish, mess, muddle, pickle |
| (verb) make infertile | Synonyms: desex, desexualise, desexualize, sterilise, sterilize, unsex |
| (verb) make fixed, stable or stationary | Synonyms: fixate |
| (verb) restore by replacing a part or putting together what is torn or broken | Synonyms: bushel, doctor, furbish up, mend, repair, restore, touch on |
| (verb) kill, preserve, and harden (tissue) in order to prepare for microscopic study | - |
| (verb) make ready or suitable or equip in advance for a particular purpose or for some use, event, etc | Synonyms: gear up, prepare, ready, set, set up |
| (verb) decide upon or fix definitely | Synonyms: define, determine, limit, set, specify |
| (verb) take vengeance on or get even | Synonyms: get, pay back, pay off |
| (verb) cause to be firmly attached | Synonyms: fasten, secure |
| (verb) put (something somewhere) firmly | Synonyms: deposit, posit, situate |
| (verb) prepare for eating by applying heat | Synonyms: cook, make, prepare, ready |
| (verb) set or place definitely | - |
| (verb) to be about to do something | - |
| (verb) influence an event or its outcome by illegal means | - |
| flax | (noun) plant of the genus Linum that is cultivated for its seeds and for the fibers of its stem | - |
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| (noun) fiber of the flax plant that is made into thread and woven into linen fabric | - |
| flex | (noun) the act of flexing | - |
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| (verb) cause (an object) to assume a crooked or angular form | Synonyms: bend, deform, turn, twist |
| (verb) bend a joint | Synonyms: bend |
| (verb) form a curve | Synonyms: bend |
| (verb) contract | - |
| (verb) exhibit the strength of | - |
| flummox | (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex |
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| flux | (noun) in constant change | - |
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| (noun) (physics) the number of changes in energy flow across a given surface per unit area | Synonyms: flux density |
| (noun) a flow or discharge | Synonyms: fluxion |
| (noun) the lines of force surrounding a permanent magnet or a moving charged particle | Synonyms: magnetic field, magnetic flux |
| (noun) excessive discharge of liquid from a cavity or organ (as in watery diarrhea) | - |
| (noun) a state of uncertainty about what should be done (usually following some important event) preceding the establishment of a new direction of action | Synonyms: state of flux |
| (noun) a substance added to molten metals to bond with impurities that can then be readily removed | - |
| (noun) the rate of flow of energy or particles across a given surface | - |
| (verb) mix together different elements | Synonyms: blend, coalesce, combine, commingle, conflate, fuse, immix, meld, merge, mix |
| (verb) become liquid or fluid when heated | Synonyms: liquefy, liquify |
| (verb) move or progress freely as if in a stream | Synonyms: flow |
| fornix | (noun) an arched bundle of white fibers at the base of the brain by which the hippocampus of each hemisphere projects to the contralateral hippocampus and to the thalamus and mamillary bodies | Synonyms: trigonum cerebrale |
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| (noun) generally any arch shaped structure (but often it refers to the arched roof of an anatomical space) | - |
| fox | (noun) alert carnivorous mammal with pointed muzzle and ears and a bushy tail; most are predators that do not hunt in packs | - |
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| (noun) a shifty deceptive person | Synonyms: dodger, slyboots |
| (noun) the grey or reddish-brown fur of a fox | - |
| (verb) become discolored with, or as if with, mildew spots | - |
| (verb) be confusing or perplexing to; cause to be unable to think clearly | Synonyms: bedevil, befuddle, confound, confuse, discombobulate, fuddle, throw |
| (verb) deceive somebody | Synonyms: flim-flam, fob, play a joke on, play a trick on, play tricks, pull a fast one on, trick |
| galax | (noun) tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall | Synonyms: beetleweed, coltsfoot, Galax urceolata, galaxy, wandflower |
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| gearbox | (noun) the shell (metal casing) in which a train of gears is sealed | Synonyms: gear box, gear case |
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| googolplex | (noun) a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol) | - |
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| haemothorax | (noun) accumulation of blood in the pleural cavity (the space between the lungs and the walls of the chest) | Synonyms: hemothorax |
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| hallux | (noun) the first largest innermost toe | Synonyms: big toe, great toe |
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| hatbox | (noun) a round piece of luggage for carrying hats | - |
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| helix | (noun) a structure consisting of something wound in a continuous series of loops | Synonyms: coil, spiral, volute, whorl |
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| (noun) a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle | Synonyms: spiral |
| hemothorax | (noun) accumulation of blood in the pleural cavity (the space between the lungs and the walls of the chest) | Synonyms: haemothorax |
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| heterodox | (adjective) characterized by departure from accepted beliefs or standards | Synonyms: dissident, heretical |
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| hex | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hexadecimal |
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| (noun) an evil spell | Synonyms: curse, jinx, whammy |
| (verb) cast a spell over someone or something; put a hex on someone or something | Synonyms: bewitch, enchant, glamour, jinx, witch |
| hoax | (noun) something intended to deceive; deliberate trickery intended to gain an advantage | Synonyms: dupery, fraud, fraudulence, humbug, put-on |
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| (verb) subject to a playful hoax or joke | Synonyms: play a joke on, pull someone's leg |
| homeobox | (noun) one of various similar homeotic genes that are involved in bodily segmentation during embryonic development | Synonyms: homeobox gene |
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| horsebox | (noun) a conveyance (railroad car or trailer) for transporting racehorses | - |
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| hotbox | (noun) a journal bearing (as of a railroad car) that has overheated | - |
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| hydrothorax | (noun) accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys | - |
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| hyrax | (noun) any of several small ungulate mammals of Africa and Asia with rodent-like incisors and feet with hooflike toes | Synonyms: coney, cony, das, dassie |
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| ibex | (noun) wild goat of mountain areas of Eurasia and northern Africa having large recurved horns | Synonyms: Capra ibex |
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| icebox | (noun) white goods in which food can be stored at low temperatures | Synonyms: refrigerator |
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| ilx | (adjective) being nine more than fifty | Synonyms: 59, fifty-nine |
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| ilxx | (adjective) being nine more than sixty | Synonyms: 69, sixty-nine |
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| ilxxx | (adjective) being nine more than seventy | Synonyms: 79, seventy-nine |
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