| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| archives | (noun) collection of records especially about an institution | - |
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| archivist | (noun) a person in charge of collecting and cataloguing archives | - |
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| archness | (noun) inappropriate playfulness | Synonyms: impertinence, perkiness, pertness, sauciness |
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| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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| archpriest | (noun) a senior clergyman and dignitary | Synonyms: hierarch, high priest, prelate, primate |
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| arcsec | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsecant, inverse secant |
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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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| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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| arcsin | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsine, inverse sine |
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| arcsine | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsin, inverse sine |
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| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| argasid | (noun) tick lacking a dorsal shield and having mouth parts on the under side of the head | Synonyms: soft tick |
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| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| argosy | (noun) one or more large merchant ships | - |
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| argus | (noun) large brilliantly patterned East Indian pheasant | Synonyms: argus pheasant |
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| arianist | (noun) an adherent of Arianism (the belief that Jesus Christ was not truly God) | - |
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| aridness | (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridity, thirstiness |
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| arioso | (noun) (music) a short recitative that is melodic but is not an aria | - |
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| arishth | (noun) large semi-evergreen tree of the East Indies; trunk exudes a tenacious gum; bitter bark used as a tonic; seeds yield an aromatic oil; sometimes placed in genus Melia | Synonyms: Azadirachta indica, margosa, Melia Azadirachta, neem, neem tree, nim tree |
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| arista | (noun) bristlelike process near the tip of the antenna of certain flies | - |
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| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| aristocrat | (noun) a member of the aristocracy | Synonyms: blue blood, patrician |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| arles | (noun) money given by a buyer to a seller to bind a contract | Synonyms: earnest money |
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| armistice | (noun) a state of peace agreed to between opponents so they can discuss peace terms | Synonyms: cease-fire, truce |
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| armrest | (noun) a support for the arm | - |
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| arms | (noun) weapons considered collectively | Synonyms: implements of war, munition, weaponry, weapons system |
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| (noun) the official symbols of a family, state, etc. | Synonyms: blazon, blazonry, coat of arms |
| arousal | (noun) the act of arousing | Synonyms: rousing |
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| (noun) mutual sexual fondling prior to sexual intercourse | Synonyms: foreplay, stimulation |
| (noun) awakening from sleep | - |
| (noun) a state of heightened physiological activity | - |
| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| arras | (noun) a wall hanging of heavy handwoven fabric often with pictorial designs | Synonyms: tapestry |
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| arrears | (noun) an unpaid overdue debt | - |
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| (noun) the state of being behind in payments | - |
| arrest | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: apprehension, catch, collar, pinch, taking into custody |
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| (noun) the state of inactivity following an interruption | Synonyms: check, halt, hitch, stay, stop, stoppage |
| arrester | (noun) a restraint that slows airplanes as they land on the flight deck of an aircraft carrier | Synonyms: arrester hook |
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| arriviste | (noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class | Synonyms: nouveau-riche, parvenu, upstart |
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| arrowsmith | (noun) a maker of arrows | - |
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| arse | (noun) vulgar slang for anus | Synonyms: arsehole, asshole, bunghole |
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| (noun) the fleshy part of the human body that you sit on | Synonyms: ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| arsehole | (noun) vulgar slang for anus | Synonyms: arse, asshole, bunghole |
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| arsenal | (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armory, armoury |
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| (noun) a place where arms are manufactured | Synonyms: armory, armoury |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, armoury |
| arsenate | (noun) a salt or ester of arsenic acid | - |
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| arsenic | (noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar | Synonyms: As, atomic number 33 |
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| (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic |
| arsenical | (noun) a pesticide or drug containing arsenic | - |
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| arsenide | (noun) a compound of arsenic with a more positive element | - |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| arsine | (noun) a poisonous colorless flammable gas used in organic synthesis and to dope transistors and as a poison gas in warfare | - |
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| arson | (noun) malicious burning to destroy property | Synonyms: fire-raising, incendiarism |
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| arsonist | (noun) a criminal who illegally sets fire to property | Synonyms: firebug, incendiary |
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| artemisia | (noun) any of various composite shrubs or herbs of the genus Artemisia having aromatic green or greyish foliage | - |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arteritis | (noun) inflammation of an artery | - |
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| artfulness | (noun) the quality of being adroit in taking unfair advantage | - |
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| arthritis | (noun) inflammation of a joint or joints | - |
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| arthrocentesis | (noun) removal of fluid from a joint by centesis | - |
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| arthrodesis | (noun) the surgical fixation of a joint which is intended to result in bone fusion | - |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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| arthroscopy | (noun) a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision | - |
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| arthrospore | (noun) one of a string of thick walled vegetative resting cells formed by some algae and fungi | - |
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| (noun) a body that resembles a spore but is not an endospore; produced by some bacteria | - |
| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| artificialism | (noun) Czech surrealism founded in 1928 by Jindrich Styrsky and Toyen (Marie Cerminova). | - |
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| artisan | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artificer, craftsman, journeyman |
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| artist | (noun) a person whose creative work shows sensitivity and imagination | Synonyms: creative person |
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| artiste | (noun) a public performer (a dancer or singer) | - |
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| artistry | (noun) a superior skill that you can learn by study and practice and observation | Synonyms: art, prowess |
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| artlessness | (noun) ingenuousness by virtue of being free from artful deceit | - |
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| (noun) the quality of innocent naivete | Synonyms: ingenuousness, innocence, naturalness |
| arts | (noun) studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills) | Synonyms: humanistic discipline, humanities, liberal arts |
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| asafetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafoetida |
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| asafoetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafetida |
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| asana | (noun) (Hinduism) a posture or manner of sitting (as in the practice of yoga) | - |
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| asarabacca | (noun) thick creeping evergreen herb of western Europe | Synonyms: Asarum europaeum |
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| asbestos | (noun) a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer | - |
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| asbestosis | (noun) lung disease caused by inhaling asbestos particles | - |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascendance | (noun) the state that exists when one person or group has power over another | Synonyms: ascendancy, ascendence, ascendency, control, dominance |
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| ascendancy | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendence, ascendency, control, dominance |
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| ascendant | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendent, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendent |
| ascendence | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendency, control, dominance |
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| ascendency | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendence, control, dominance |
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| ascendent | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendant |
| ascender | (noun) (printing) the part of tall lowercase letters that extends above the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending above other lowercase letters | - |
| (noun) someone who ascends | - |
| ascending | (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
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| ascension | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascent, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascent, rise, rising |
| (noun) (astronomy) the rising of a star above the horizon | - |
| ascent | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascension, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascension, rise, rising |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, climb, raise, rise, upgrade |
| ascesis | (noun) rigorous self-denial and active self-restraint | Synonyms: asceticism |
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| ascetic | (noun) someone who practices self denial as a spiritual discipline | Synonyms: abstainer |
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| asceticism | (noun) rigorous self-denial and active self-restraint | Synonyms: ascesis |
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| (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: austerity, nonindulgence |
| (noun) the doctrine that through renunciation of worldly pleasures it is possible to achieve a high spiritual or intellectual state | - |
| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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| ascites | (noun) accumulation of serous fluid in peritoneal cavity | - |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| ascolichen | (noun) a lichen in which the fungus component is an ascomycete | - |
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| ascoma | (noun) an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle | - |
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