| addax | (noun) large antelope with lightly spiraled horns of desert regions of northern Africa | Synonyms: Addax nasomaculatus |
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| affix | (noun) a linguistic element added to a word to produce an inflected or derived form | - |
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| annex | (noun) an addition that extends a main building | Synonyms: annexe, extension, wing |
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| 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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| 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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| 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 |
| 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 | - |
| coax | (noun) a transmission line for high-frequency signals | Synonyms: coax cable, coaxial cable |
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| 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. | - |
| complex | (noun) a whole structure (as a building) made up of interconnected or related structures | Synonyms: building complex |
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| (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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| 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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| 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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| 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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| detox | (noun) the hospital ward or clinic in which patients are detoxified | - |
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| dominatrix | (noun) a dominating woman (especially one who plays that role in a sadomasochistic sexual relationship) | - |
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| duplex | (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
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| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| 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 | (noun) the 24th letter of the Roman alphabet | Synonyms: X, x |
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| (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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| fax | (noun) duplicator that transmits the copy by wire or radio | Synonyms: facsimile, facsimile machine |
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| 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 |
| 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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| 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 | - |
| 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 | - |
| 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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| hex | (noun) an evil spell | Synonyms: curse, jinx, whammy |
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| hoax | (noun) something intended to deceive; deliberate trickery intended to gain an advantage | Synonyms: dupery, fraud, fraudulence, humbug, put-on |
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| 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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| index | (noun) the finger next to the thumb | Synonyms: forefinger, index finger |
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| (noun) an alphabetical listing of names and topics along with page numbers where they are discussed | - |
| (noun) a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time | Synonyms: index number, indicant, indicator |
| (noun) a mathematical notation indicating the number of times a quantity is multiplied by itself | Synonyms: exponent, power |
| (noun) a numerical scale used to compare variables with one another or with some reference number | - |
| infix | (noun) an affix that is inserted inside the word | - |
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| influx | (noun) the process of flowing in | Synonyms: inflow |
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| inheritrix | (noun) a female heir | Synonyms: heiress, inheritress |
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| intersex | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: androgyne, epicene, epicene person, gynandromorph, hermaphrodite |
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| isolex | (noun) an isogloss marking off the area in which a particular item of vocabulary is found. | - |
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| jinx | (noun) an evil spell | Synonyms: curse, hex, whammy |
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| (noun) a person believed to bring bad luck to those around him | Synonyms: jonah |
| jukebox | (noun) a cabinet containing an automatic record player; records are played by inserting a coin | Synonyms: nickelodeon |
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| kylix | (noun) a shallow drinking cup with two handles; used in ancient Greece | Synonyms: cylix |
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| laryngopharynx | (noun) the lower part of the pharynx | - |
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| larynx | (noun) a cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech | Synonyms: voice box |
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| latex | (noun) a water-base paint that has a latex binder | Synonyms: latex paint, rubber-base paint |
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| (noun) a milky exudate from certain plants that coagulates on exposure to air | - |
| lockbox | (noun) a fireproof metal strongbox (usually in a bank) for storing valuables | Synonyms: deposit box, safe-deposit, safe-deposit box, safety-deposit, safety deposit box |
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| lox | (noun) brine-cured salmon that is lightly smoked | - |
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| lummox | (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lout, lubber, lump, oaf, stumblebum |
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| lux | (noun) a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle | Synonyms: lx |
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| lx | (noun) a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle | Synonyms: lux |
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| lynx | (noun) short-tailed wildcats with usually tufted ears; valued for their fur | Synonyms: catamount |
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| (noun) a text browser | - |