| ace | (adjective) of the highest quality | Synonyms: A-one, crack, first-rate, super, tiptop, top-notch, topnotch, tops |
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| (noun) a serve that the receiver is unable to reach | - |
| (noun) one of four playing cards in a deck having a single pip on its face | - |
| (noun) someone who is dazzlingly skilled in any field | Synonyms: adept, champion, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, I, one, single, unity |
| (verb) score an ace against | - |
| (verb) serve an ace against (someone) | - |
| (verb) play (a hole) in one stroke | - |
| (verb) succeed at easily | Synonyms: breeze through, nail, pass with flying colors, sail through, sweep through |
| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| acedia | (noun) apathy and inactivity in the practice of virtue (personified as one of the deadly sins) | Synonyms: laziness, sloth |
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| acellular | (adjective) not made up of or divided into cells | Synonyms: noncellular |
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| acentric | (adjective) lacking a centromere | - |
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| (adjective) not centered or having no center | - |
| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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| acephalous | (adjective) lacking a head or a clearly defined head | - |
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| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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| acerate | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerose, acicular, needle-shaped |
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| acerb | (adjective) sour or bitter in taste | Synonyms: acerbic, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acerbate | (verb) make sour or bitter | - |
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| (verb) cause to be bitter or resentful | Synonyms: embitter, envenom |
| acerbic | (adjective) sour or bitter in taste | Synonyms: acerb, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acerbity | (noun) a rough and bitter manner | Synonyms: acrimony, bitterness, jaundice, tartness, thorniness |
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| (noun) a sharp sour taste | Synonyms: tartness |
| (noun) a sharp bitterness | - |
| acerola | (noun) acid red or yellow cherry-like fruit of a tropical American shrub very rich in vitamin C | Synonyms: barbados cherry, surinam cherry, West Indian cherry |
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| (noun) tropical American shrub bearing edible acid red fruit resembling cherries | Synonyms: barbados cherry, Malpighia glabra, Surinam cherry, West Indian cherry |
| acerose | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerate, acicular, needle-shaped |
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| acervate | (adjective) pertaining to a growth of fungi that forms a heaped-up mass | - |
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| acervulus | (noun) small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi | - |
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| acetabular | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: cotyloid, cotyloidal |
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| acetabulum | (noun) the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint | Synonyms: cotyloid cavity |
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| acetal | (noun) any organic compound formed by adding alcohol molecules to aldehyde molecules | - |
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| acetaldehyde | (noun) a colorless volatile water-soluble liquid aldehyde used chiefly in the manufacture of acetic acid and perfumes and drugs | Synonyms: ethanal |
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| acetaldol | (noun) unsaturated aldol | - |
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| acetamide | (noun) a colorless solid amide of acetic acid used as a solvent and in the synthesis of organic compounds | Synonyms: ethanamide |
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| acetaminophen | (noun) an analgesic for mild pain but not for inflammation; also used as an antipyretic; (Datril, Tylenol, Panadol, Phenaphen, Tempra, and Anacin III are trademarks of brands of acetaminophen tablets) | Synonyms: Anacin III, Datril, Panadol, Phenaphen, Tempra, Tylenol |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| acetate | (noun) a fabric made from fibers of cellulose acetate | Synonyms: acetate rayon |
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| (noun) a salt or ester of acetic acid | Synonyms: ethanoate |
| acetic | (adjective) relating to or containing acetic acid | - |
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| acetify | (verb) turn acidic | Synonyms: acidify |
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| (verb) make sour or more sour | Synonyms: acidify, acidulate, sour |
| acetin | (noun) any of three liquid acetates that are formed when acetic acid and glycerin are heated together | - |
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| acetone | (noun) the simplest ketone; a highly flammable liquid widely used as an organic solvent and as material for making plastics | Synonyms: dimethyl ketone, propanone |
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| acetonemia | (noun) an abnormal increase of ketone bodies in the blood as in diabetes mellitus | Synonyms: ketonemia, ketosis |
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| acetonic | (adjective) of or relating to acetone | - |
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| acetonuria | (noun) excessive amounts of ketone bodies in the urine as in diabetes mellitus or starvation | Synonyms: ketoaciduria, ketonuria |
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| acetophenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetphenetidin, phenacetin |
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| acetose | (adjective) tasting or smelling like vinegar | Synonyms: acetous, vinegarish, vinegary |
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| acetous | (adjective) tasting or smelling like vinegar | Synonyms: acetose, vinegarish, vinegary |
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| acetphenetidin | (noun) a white crystalline compound used as an analgesic and also as an antipyretic | Synonyms: acetophenetidin, phenacetin |
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| acetum | (noun) sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative | Synonyms: vinegar |
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| (noun) a dilute solution of acetic acid that is used as a solvent (e.g. for a drug) | - |
| acetyl | (noun) the organic group of acetic acid (CH3CO-) | Synonyms: acetyl group, acetyl radical, ethanoyl group, ethanoyl radical |
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| acetylate | (verb) receive substitution of an acetyl group | Synonyms: acetylise, acetylize |
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| (verb) introduce an acetyl group into (a chemical compound) | Synonyms: acetylise, acetylize |
| acetylation | (noun) the process of introducing an acetyl group into a compound | - |
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| acetylcholine | (noun) a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems | - |
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| acetylene | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: alkyne, ethyne |
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| acetylenic | (adjective) of or related to acetylene | - |
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| acetylic | (adjective) of or related to acetic acid | - |
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| acetylise | (verb) receive substitution of an acetyl group | Synonyms: acetylate, acetylize |
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| (verb) introduce an acetyl group into (a chemical compound) | Synonyms: acetylate, acetylize |
| acetylize | (verb) receive substitution of an acetyl group | Synonyms: acetylate, acetylise |
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| (verb) introduce an acetyl group into (a chemical compound) | Synonyms: acetylate, acetylise |
| adjacency | (noun) the attribute of being so near as to be touching | Synonyms: contiguity, contiguousness |
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| adjacent | (adjective) nearest in space or position; immediately adjoining without intervening space | Synonyms: next, side by side |
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| (adjective) having a common boundary or edge; abutting; touching | Synonyms: conterminous, contiguous, neighboring, neighbouring |
| (adjective) near or close to but not necessarily touching | - |
| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| alliaceous | (adjective) of or pertaining to the botanical genus Allium | - |
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| (adjective) smelling of onions or garlic | - |
| amentaceous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentiferous |
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| amylaceous | (adjective) resembling starch | Synonyms: amyloid, amyloidal, farinaceous, starchlike |
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| anyplace | (adverb) at or in or to any place | Synonyms: anywhere |
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| apace | (adverb) with speed | Synonyms: chop-chop, in short order, quickly, rapidly, speedily |
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| (adverb) (poetic, literary) quickly | - |
| aplacental | (adjective) having no placenta | - |
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| apocynaceous | (adjective) of or relating to tropical plants of the family Apocynaceae | - |
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| araceous | (adjective) relating to a plant of the family Araceae | Synonyms: aroid |
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| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arenaceous | (adjective) resembling or containing or abounding in sand; or growing in sandy areas | Synonyms: sandlike, sandy |
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| argillaceous | (adjective) resembling or containing clay | Synonyms: clayey |
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| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| backspace | (noun) the typewriter key used for back spacing | Synonyms: backspace key, backspacer |
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| (verb) hit the backspace key on a computer or typewriter keyboard | - |
| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| barefaced | (adjective) with no effort to conceal | Synonyms: bald |
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| (adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, bodacious, brassy, brazen-faced, brazen, insolent |
| barefacedly | (adverb) without shame | Synonyms: shamelessly, unashamedly |
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| betulaceous | (adjective) of or pertaining to or characteristic of trees of the birch family | - |
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| biface | (adjective) having two faces or fronts | Synonyms: bifacial |
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| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| birthplace | (noun) the place where someone was born | Synonyms: place of birth |
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| (noun) where something originated or was nurtured in its early existence | Synonyms: cradle, place of origin, provenance, provenience |
| blackface | (noun) the makeup (usually burnt cork) used by a performer in order to imitate a Negro | - |
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| boldface | (noun) a typeface with thick heavy lines | Synonyms: bold, bold face |
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| (verb) print in boldface | - |
| boniface | (noun) the owner or manager of an inn | Synonyms: host, innkeeper |
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| bootlace | (noun) a long lace for fastening boots | - |
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| brace | (noun) a structural member used to stiffen a framework | Synonyms: bracing |
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| (noun) a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring | Synonyms: bitstock |
| (noun) an appliance that corrects dental irregularities | Synonyms: braces, orthodontic braces |
| (noun) a support that steadies or strengthens something else | - |
| (noun) elastic straps that hold trousers up | Synonyms: gallus, suspender |
| (noun) a rope on a square-rigged ship that is used to swing a yard about and secure it | - |
| (noun) either of two punctuation marks ({ or }) used to enclose textual material | - |
| (noun) a set of two similar things considered as a unit | Synonyms: pair |
| (noun) two items of the same kind | Synonyms: couple, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| (verb) cause to be alert and energetic | Synonyms: arouse, energise, energize, perk up, stimulate |
| (verb) support by bracing | - |
| (verb) support or hold steady and make steadfast, with or as if with a brace | Synonyms: stabilise, stabilize, steady |
| (verb) prepare (oneself), often but not necessarily for something unpleasant or difficult | Synonyms: poise |
| braced | (adjective) positioned so as to be ready for confrontation or danger | - |
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| (adjective) held up by braces or buttresses | Synonyms: buttressed |
| bracelet | (noun) jewelry worn around the wrist for decoration | Synonyms: bangle |
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| (noun) a band of cloth or leather or metal links attached to a wristwatch and wrapped around the wrist | Synonyms: watch bracelet, watchband, watchstrap, wristband |
| bracer | (noun) a tonic or restorative (especially a drink of liquor) | Synonyms: pick-me-up |
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| (noun) a protective covering for the wrist or arm that is used in archery and fencing and other sports | Synonyms: armguard |
| bracero | (noun) a Mexican laborer who worked in the United States on farms and railroads in order to ease labor shortages during World War II | - |
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| braces | (noun) an appliance that corrects dental irregularities | Synonyms: brace, orthodontic braces |
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| bulbaceous | (adjective) producing or growing from bulbs | - |
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| bullace | (noun) small wild or half-domesticated Eurasian plum bearing small ovoid fruit in clusters | Synonyms: Prunus insititia |
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| butyraceous | (adjective) having the qualities of butter or yielding or containing a substance like butter | - |
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| camphoraceous | (adjective) being or having the properties of camphor | - |
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| carapace | (noun) hard outer covering or case of certain organisms such as arthropods and turtles | Synonyms: cuticle, shell, shield |
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| carbonaceous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonic, carboniferous, carbonous |
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| caryophyllaceous | (adjective) of or pertaining to plants of the family Caryophyllaceae | - |
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| cetacean | (adjective) of or relating to whales and dolphins etc | Synonyms: cetaceous |
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| (noun) large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals | Synonyms: blower, cetacean mammal |
| cetaceous | (adjective) of or relating to whales and dolphins etc | Synonyms: cetacean |
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| chartaceous | (adjective) of or like paper | Synonyms: paperlike, papery |
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| chloroacetophenone | (noun) a tear gas that is weaker than CS gas but lasts longer | Synonyms: CN gas |
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| chylaceous | (adjective) consisting of chyle or having the properties of chyle | Synonyms: chylous |
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| coalface | (noun) the part of a coal seam that is being cut | - |
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| commonplace | (adjective) not challenging; dull and lacking excitement | Synonyms: humdrum, prosaic, unglamorous, unglamourous |
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| (adjective) repeated too often; overfamiliar through overuse | Synonyms: banal, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, trite, well-worn |
| (adjective) completely ordinary and unremarkable | - |
| (noun) a trite or obvious remark | Synonyms: banality, bromide, cliche, platitude |
| commonplaceness | (noun) ordinariness as a consequence of being frequent and commonplace | Synonyms: commonness, everydayness |
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| complacence | (noun) the feeling you have when you are satisfied with yourself | Synonyms: complacency, self-complacency, self-satisfaction |
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