| archetypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, prototypal, prototypic, prototypical |
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| arcsecant | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsec, inverse secant |
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| areca | (noun) any of several tall tropical palms native to southeastern Asia having egg-shaped nuts | - |
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| aristocratical | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, blue-blooded, blue, gentle, patrician |
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| aristocratically | (adverb) in an aristocratic manner | - |
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| arithmetical | (adjective) relating to or involving arithmetic | Synonyms: arithmetic |
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| arithmetically | (adverb) with respect to arithmetic | - |
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| arnica | (noun) an ointment used in treating bruises | - |
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| (noun) any of various rhizomatous usually perennial plants of the genus Arnica | - |
| (noun) used especially in treating bruises | - |
| arrhythmical | (adjective) without regard for rhythm | Synonyms: arrhythmic |
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| arsenical | (adjective) relating to or containing arsenic | - |
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| (noun) a pesticide or drug containing arsenic | - |
| artistically | (adverb) in an artistic manner | - |
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| asarabacca | (noun) thick creeping evergreen herb of western Europe | Synonyms: Asarum europaeum |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascetical | (adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline | Synonyms: ascetic |
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| (adjective) practicing great self-denial | Synonyms: ascetic, austere, spartan |
| ascetically | (adverb) in an ascetic manner | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ashcake | (noun) corn bread wrapped in cabbage leaves and baked in hot ashes (southern) | Synonyms: ash cake, corn tash |
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| ashcan | (noun) a bin that holds rubbish until it is collected | Synonyms: ash-bin, ash bin, ashbin, dustbin, garbage can, trash barrel, trash bin, trash can, wastebin |
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| aspherical | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspheric |
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| astrological | (adjective) relating to or concerned with astrology | - |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| astronomical | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomic |
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| (adjective) inconceivably large | Synonyms: astronomic, galactic |
| astronomically | (adverb) enormously | - |
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| astrophysical | (adjective) of or concerned with astrophysics | - |
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| asymmetrical | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetric |
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| (adjective) irregular in shape or outline | Synonyms: crooked |
| asymmetrically | (adverb) in an asymmetrical manner | Synonyms: unsymmetrically |
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| asymptotically | (adverb) toward an asymptote | - |
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| atheistical | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistic |
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| (adjective) rejecting any belief in gods | Synonyms: atheistic, unbelieving |
| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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| atypical | (adjective) not representative of a group, class, or type | Synonyms: atypic, untypical |
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| (adjective) deviating from normal expectations; somewhat odd, strange, or abnormal | Synonyms: irregular |
| atypicality | (noun) any state that is not typical | Synonyms: untypicality |
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| atypically | (adverb) in a manner that is not typical | Synonyms: untypically |
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| audiocassette | (noun) a cassette for audiotape | - |
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| auspicate | (verb) commence in a manner calculated to bring good luck | - |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| autarchical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarkical |
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| autarkical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarchical |
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| (adjective) of countries; not relying on imports | Synonyms: autarkic |
| authentically | (adverb) genuinely; with authority | Synonyms: genuinely |
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| authenticate | (verb) establish the authenticity of something | - |
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| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| autobiographical | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographic |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographic |
| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autocatalytic | (adjective) relating to or proceeding by autocatalysis | - |
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| autocratically | (adverb) in an autocratic manner | - |
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| (adverb) in an overbearingly domineering manner; as a dictator | Synonyms: dictatorially, magisterially |
| automatically | (adverb) in a reflex manner | - |
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| (adverb) in a mechanical manner; by a mechanism | Synonyms: mechanically |
| avocado | (adjective) of the dull yellowish green of the meat of an avocado | - |
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| (noun) a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed | Synonyms: aguacate, alligator pear, avocado pear |
| (noun) tropical American tree bearing large pulpy green fruits | Synonyms: avocado tree, Persea Americana |
| avocation | (noun) an auxiliary activity | Synonyms: by-line, hobby, pursuit, sideline, spare-time activity |
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| avocational | (adjective) of or involved in an avocation | - |
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| axiological | (adjective) of or relating to the study of values | - |
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| axiomatical | (adjective) of or relating to or derived from axioms | Synonyms: axiomatic, postulational |
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| axiomatically | (adverb) on the basis of axioms | - |
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| bacca | (noun) an indehiscent fruit derived from a single ovary having one or many seeds within a fleshy wall or pericarp: e.g. grape, tomato, cranberry | Synonyms: simple fruit |
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| baccalaureate | (noun) an academic degree conferred on someone who has successfully completed undergraduate studies | Synonyms: bachelor's degree |
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| (noun) a farewell sermon to a graduating class at their commencement ceremonies | - |
| baccarat | (noun) a card game played in casinos in which two or more punters gamble against the banker; the player wins who holds 2 or 3 cards that total closest to nine | Synonyms: chemin de fer |
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| baccate | (adjective) resembling a berry | Synonyms: berrylike |
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| (adjective) producing or bearing berries | Synonyms: bacciferous, berried |
| backscatter | (verb) scatter (radiation) by the atoms of the medium through which it passes | - |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| barbacan | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbican |
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| barbican | (noun) a tower that is part of a defensive structure (such as a castle) | Synonyms: barbacan |
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| barcarole | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarolle |
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| barcarolle | (noun) a boating song sung by Venetian gondoliers | Synonyms: barcarole |
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| barometrical | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometric |
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| barricade | (noun) a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc. | Synonyms: roadblock |
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| (noun) a barrier (usually thrown up hastily) to impede the advance of an enemy | - |
| (verb) block off with barricades | Synonyms: barricado |
| (verb) prevent access to by barricading | - |
| (verb) render unsuitable for passage | Synonyms: bar, block, block off, block up, blockade, stop |
| barricaded | (adjective) preventing entry or exit or a course of action | Synonyms: barred, blockaded |
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| barricado | (verb) block off with barricades | Synonyms: barricade |
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| basically | (adverb) in essence; at bottom or by one's (or its) very nature | Synonyms: essentially, fundamentally |
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| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| basilican | (adjective) of or relating to or resembling a basilica | - |
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| bathymetrical | (adjective) of or relating to measurements of the depths of oceans or lakes | Synonyms: bathymetric |
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| bathyscape | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscaph, bathyscaphe |
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| bathyscaph | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaphe |
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| bathyscaphe | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaph |
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| battercake | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: flannel-cake, flannel cake, flapcake, flapjack, griddlecake, hot cake, hotcake, pancake |
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| bearcat | (noun) arboreal civet of Asia having a long prehensile tail and shaggy black hair | Synonyms: Arctictis bintourong, binturong |
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| beatification | (noun) (Roman Catholic Church) an act of the Pope who declares that a deceased person lived a holy life and is worthy of public veneration; a first step toward canonization | - |
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| (noun) the action of rendering supremely blessed and extremely happy | - |
| (noun) a state of supreme happiness | Synonyms: beatitude, blessedness |
| beautification | (noun) the act of making something more beautiful | - |
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| becalm | (verb) make steady | Synonyms: calm, steady |
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| becalmed | (adjective) rendered motionless for lack of wind | - |
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| beefcake | (noun) a photograph of a muscular man in minimal attire | - |
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| benzocaine | (noun) a white crystalline ester used as a local anesthetic | Synonyms: ethyl aminobenzoate |
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| biblical | (adjective) of or pertaining to or contained in or in accordance with the Bible | Synonyms: scriptural |
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| (adjective) in keeping with the nature of the Bible or its times or people | - |
| bibliographical | (adjective) relating to or dealing with bibliography | Synonyms: bibliographic |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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| bibliotheca | (noun) a collection of books | - |
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| bibliothecal | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecarial |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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| bicameral | (adjective) composed of two legislative bodies | - |
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| (adjective) consisting of two chambers | Synonyms: two-chambered |
| bicapsular | (adjective) divided into two capsules or having a two-part capsule | - |
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| bicarbonate | (noun) a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate | Synonyms: hydrogen carbonate |
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| biconcave | (adjective) concave on both sides | Synonyms: concavo-concave |
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| bicylindrical | (adjective) having two cylindrical surfaces usually with parallel axes | - |
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| bifocal | (adjective) having two foci | - |
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| bifocals | (noun) (plural) eyeglasses having two focal lengths, one for near vision and the other for far vision | - |
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| bifurcate | (adjective) resembling a fork; divided or separated into two branches | Synonyms: biramous, branched, forficate, fork-like, forked, pronged, prongy |
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| (verb) divide into two branches | - |
| (verb) split or divide into two | - |