| assimilatory | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilative |
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| astragalar | (adjective) of or relating to the anklebone | - |
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| astrolabe | (noun) an early form of sextant | - |
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| astrolatry | (noun) the worship of planets or stars | Synonyms: worship of heavenly bodies |
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| astylar | (adjective) lacking columns or pillars | - |
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| atlas | (noun) a figure of a man used as a supporting column | Synonyms: telamon |
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| (noun) the 1st cervical vertebra | Synonyms: atlas vertebra |
| (noun) a collection of maps in book form | Synonyms: book of maps, map collection |
| atrioventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: auriculoventricular |
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| auricula | (noun) a pouch projecting from the top front of each atrium of the heart | Synonyms: auricular appendage, auricular appendix |
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| (noun) yellow-flowered primrose native to Alps; commonly cultivated | Synonyms: bear's ear, Primula auricula |
| auricular | (adjective) of or relating to near the ear | Synonyms: otic |
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| (adjective) pertaining to an auricle of the heart | - |
| (adjective) relating to or perceived by or shaped like the organ of hearing | - |
| auriculare | (noun) the craniometric point at the center of the opening of the external acoustic meatus | Synonyms: auricular point |
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| auriculate | (adjective) having auricles | Synonyms: auriculated |
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| auriculated | (adjective) having auricles | Synonyms: auriculate |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| autoalarm | (noun) a radio receiving device used on ships that rings an alarm bell when a distress signal is received. | Synonyms: auto-alarm |
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| autoclave | (noun) a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments | Synonyms: steriliser, sterilizer |
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| (verb) subject to the action of an autoclave | - |
| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| autoregulation | (noun) (physiology) processes that maintain a generally constant physiological state in a cell or organism | - |
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| availability | (noun) the quality of being at hand when needed | Synonyms: accessibility, availableness, handiness |
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| available | (adjective) obtainable or accessible and ready for use or service | - |
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| (adjective) convenient for use or disposal | Synonyms: usable, useable |
| (adjective) not busy; not otherwise committed | Synonyms: uncommitted |
| availableness | (noun) the quality of being at hand when needed | Synonyms: accessibility, availability, handiness |
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| avalanche | (noun) a slide of large masses of snow and ice and mud down a mountain | - |
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| (noun) a sudden appearance of an overwhelming number of things | - |
| (verb) gather into a huge mass and roll down a mountain, of snow | Synonyms: roll down |
| avascular | (adjective) without blood vessels | - |
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| avellan | (adjective) pertaining to filberts or hazelnuts | Synonyms: avellane |
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| avellane | (adjective) pertaining to filberts or hazelnuts | Synonyms: avellan |
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| avuncular | (adjective) being or relating to an uncle | - |
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| (adjective) resembling an uncle in kindness or indulgence | - |
| axilla | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: armpit, axillary cavity, axillary fossa |
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| axillary | (adjective) of or relating to the armpit | - |
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| (adjective) of or relating to the axil | Synonyms: alar |
| ayatollah | (noun) a high-ranking Shiite religious leader who is regarded as an authority on religious law and its interpretation and who has political power as well | - |
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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 | - |
| bacillar | (adjective) relating to or produced by or containing bacilli | Synonyms: bacillary |
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| (adjective) formed like a bacillus | Synonyms: bacillary, bacilliform, baculiform, rod-shaped |
| bacillary | (adjective) relating to or produced by or containing bacilli | Synonyms: bacillar |
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| (adjective) formed like a bacillus | Synonyms: bacillar, bacilliform, baculiform, rod-shaped |
| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| backlash | (noun) an adverse reaction to some political or social occurrence | - |
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| (noun) a movement back from an impact | Synonyms: rebound, recoil, repercussion |
| (verb) come back to the originator of an action with an undesired effect | Synonyms: backfire, recoil |
| backplate | (noun) plate armor protecting the back; worn as part of a cuirass | - |
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| backslap | (verb) display excessive cordiality (towards) | - |
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| backslapper | (noun) someone who demonstrates enthusiastic or excessive cordiality | - |
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| badlands | (noun) deeply eroded barren land | - |
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| bailable | (adjective) eligible for bail | - |
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| (adjective) admitting of bail | - |
| baklava | (noun) rich Middle Eastern cake made of thin layers of flaky pastry filled with nuts and honey | - |
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| balaclava | (noun) a cap that is close-fitting and woolen and covers all of the head but the face | Synonyms: balaclava helmet |
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| balagan | (noun) a word for chaos or fiasco borrowed from modern Hebrew (where it is a loan word from Russian) | - |
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| balalaika | (noun) a stringed instrument that has a triangular body and three strings | - |
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| balance | (noun) a scale for weighing; depends on pull of gravity | - |
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| (noun) a weight that balances another weight | Synonyms: counterbalance, counterpoise, counterweight, equaliser, equalizer |
| (noun) a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat | Synonyms: balance wheel |
| (noun) harmonious arrangement or relation of parts or elements within a whole (as in a design) | Synonyms: proportion, proportionality |
| (noun) (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane | Synonyms: correspondence, symmetricalness, symmetry |
| (noun) equality between the totals of the credit and debit sides of an account | - |
| (noun) the difference between the totals of the credit and debit sides of an account | - |
| (noun) something left after other parts have been taken away | Synonyms: remainder, residual, residue, residuum, rest |
| (noun) equality of distribution | Synonyms: counterbalance, equilibrium, equipoise |
| (noun) a state of equilibrium | - |
| (verb) hold or carry in equilibrium | Synonyms: poise |
| (verb) compute credits and debits of an account | - |
| (verb) bring into balance or equilibrium | Synonyms: equilibrate, equilibrise, equilibrize |
| (verb) be in equilibrium | - |
| balanced | (adjective) being in a state of proper equilibrium | - |
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| balancer | (noun) either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight | Synonyms: halter, haltere |
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| (noun) an acrobat who balances himself in difficult positions | - |
| balancing | (noun) getting two things to correspond | Synonyms: reconciliation |
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| balanitis | (noun) inflammation of the head of the penis | - |
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| balanoposthitis | (noun) inflammation of both the head of the penis and the foreskin | - |
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| balas | (noun) a pale rose-colored variety of the ruby spinel | Synonyms: balas ruby |
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| balata | (noun) a tropical hardwood tree yielding balata gum and heavy red timber | Synonyms: balata tree, beefwood, bully tree, Manilkara bidentata |
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| (noun) when dried yields a hard substance used e.g. in golf balls | Synonyms: gutta balata |
| ballad | (noun) a narrative poem of popular origin | Synonyms: lay |
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| (noun) a narrative song with a recurrent refrain | Synonyms: lay |
| ballade | (noun) a poem consisting of 3 stanzas and an envoy | - |
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| balladeer | (noun) a singer of popular ballads | Synonyms: crooner |
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| ballast | (noun) any heavy material used to stabilize a ship or airship | - |
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| (noun) an electrical device for starting and regulating fluorescent and discharge lamps | Synonyms: light ballast |
| (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast resistor, barretter |
| (noun) an attribute that tends to give stability in character and morals; something that steadies the mind or feelings | - |
| (noun) coarse gravel laid to form a bed for streets and railroads | - |
| (verb) make steady with a ballast | - |
| ballplayer | (noun) an athlete who plays baseball | Synonyms: baseball player |
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| banderilla | (noun) a decorated dart that is implanted in the neck or shoulders of the bull during a bull fight | - |
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| barbellate | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbed, briary, briery, bristled, bristly, burred, burry, prickly, setaceous, setose, spiny, thorny |
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| bardolatry | (noun) the idolization of William Shakespeare | - |
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| barilla | (noun) Algerian plant formerly burned to obtain calcium carbonate | Synonyms: Halogeton souda |
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| (noun) bushy plant of Old World salt marshes and sea beaches having prickly leaves; burned to produce a crude soda ash | Synonyms: glasswort, kali, kelpwort, Salsola kali, Salsola soda, saltwort |
| basilar | (adjective) of or relating to or located at the base | Synonyms: basilary |
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| basilary | (adjective) of or relating to or located at the base | Synonyms: basilar |
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| bedlam | (noun) a state of extreme confusion and disorder | Synonyms: chaos, pandemonium, topsy-turvydom, topsy-turvyness |
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| bedlamite | (noun) an archaic term for a lunatic | - |
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| belabor | (verb) attack verbally with harsh criticism | Synonyms: belabour |
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| (verb) beat soundly | Synonyms: belabour |
| (verb) to work at or to absurd length | Synonyms: belabour |
| belabour | (verb) attack verbally with harsh criticism | Synonyms: belabor |
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| (verb) beat soundly | Synonyms: belabor |
| (verb) to work at or to absurd length | Synonyms: belabor |
| belated | (adjective) after the expected or usual time; delayed | Synonyms: late, tardy |
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| belatedly | (adverb) later than usual or than expected | Synonyms: late, tardily |
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| belay | (noun) something to which a mountain climber's rope can be secured | - |
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| (verb) fasten a boat to a bitt, pin, or cleat | - |
| (verb) turn a rope round an object or person in order to secure it or him | - |
| belladonna | (noun) an alkaloidal extract or tincture of the poisonous belladonna plant that is used medicinally | - |
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| (noun) perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine | Synonyms: Atropa belladonna, belladonna plant, deadly nightshade |
| bellarmine | (noun) a stoneware drinking jug with a long neck; decorated with a caricature of Cardinal Bellarmine (17th century) | Synonyms: greybeard, long-beard, longbeard |
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| bellylaugh | (verb) laugh a deep, hearty laugh | - |
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| beplaster | (verb) cover conspicuously or thickly, as by pasting something on | Synonyms: plaster |
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| betulaceous | (adjective) of or pertaining to or characteristic of trees of the birch family | - |
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| biauricular | (adjective) relating to the two auditory openings | - |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibliolatry | (noun) the worship of the Bible | Synonyms: Bible-worship |
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| bicapsular | (adjective) divided into two capsules or having a two-part capsule | - |
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| bifilar | (adjective) having or using two filaments | - |
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| biflagellate | (adjective) having two flagella | - |
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| bilabial | (adjective) of or relating to or being a speech sound that is articulated using both lips | - |
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| (noun) a consonant that is articulated using both lips; /p/ or /b/ or /w/ | - |
| bilabiate | (adjective) having two lips | Synonyms: two-lipped |
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| bilateral | (adjective) having two sides or parts | Synonyms: two-sided |
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| (adjective) affecting or undertaken by two parties | - |
| (adjective) having identical parts on each side of an axis | Synonyms: bilaterally symmetric, bilaterally symmetrical, isobilateral |
| bilateralism | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilaterality |
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| bilaterality | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilateralism |
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| bilaterally | (adverb) with the involvement of two parties or governments | - |
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| (adverb) so as to involve two sides or parts | - |
| billabong | (noun) a branch of a river made by water flowing from the main stream only when the water level is high | - |
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| (noun) a stagnant pool of water in the bed of a stream that flows intermittently | - |
| bilocular | (adjective) divided into or containing two cells or chambers | Synonyms: biloculate |
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| biloculate | (adjective) divided into or containing two cells or chambers | Synonyms: bilocular |
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| bimolecular | (adjective) relating to or affecting two molecules | - |
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| binocular | (adjective) relating to both eyes | - |
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| binoculars | (noun) (plural) an optical instrument designed for simultaneous use by both eyes | Synonyms: field glasses, opera glasses |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| biovular | (adjective) (of twins) derived from two separate fertilized ova | Synonyms: fraternal |
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| biplane | (noun) old fashioned airplane; has two wings one above the other | - |
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| bipolar | (adjective) having two poles | - |
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| (adjective) of, pertaining to, or occurring in both polar regions | - |
| (adjective) of or relating to manic depressive illness | - |
| 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 |
| biteplate | (noun) a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes | Synonyms: bite plate |
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| blab | (verb) divulge confidential information or secrets | Synonyms: babble, babble out, blab out, let the cat out of the bag, peach, sing, spill the beans, talk, tattle |
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| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |