| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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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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| arctangent | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctan, inverse tangent |
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| ardeb | (noun) a unit of dry measure used in Egypt | - |
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| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| are | (noun) a unit of surface area equal to 100 square meters | Synonyms: ar |
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| area | (noun) a part of a structure having some specific characteristic or function | - |
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| (noun) the extent of a 2-dimensional surface enclosed within a boundary | Synonyms: expanse, surface area |
| (noun) a part of an animal that has a special function or is supplied by a given artery or nerve | Synonyms: region |
| (noun) a subject of study | - |
| (noun) a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography) | Synonyms: country |
| (noun) a particular environment or walk of life | Synonyms: arena, domain, field, orbit, sphere |
| areaway | (noun) a passageway between buildings or giving access to a basement | - |
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| areca | (noun) any of several tall tropical palms native to southeastern Asia having egg-shaped nuts | - |
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| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| arena | (noun) a playing field where sports events take place | Synonyms: scene of action |
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| (noun) a large structure for open-air sports or entertainments | Synonyms: bowl, sports stadium, stadium |
| (noun) the central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand | - |
| (noun) a particular environment or walk of life | Synonyms: area, domain, field, orbit, sphere |
| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| areola | (noun) small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite | Synonyms: ring of color |
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| (noun) small space in a tissue or body part such as the area between veins on a leaf or an insect's wing | - |
| arere | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: obeche, obechi, samba, Triplochiton scleroxcylon |
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| arete | (noun) a sharp narrow ridge found in rugged mountains | - |
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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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| argemone | (noun) any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America | Synonyms: devil's fig, prickly poppy, white thistle |
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| argent | (noun) a metal tincture used in heraldry to give a silvery appearance | - |
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| argentine | (noun) any of various small silver-scaled salmon-like marine fishes | - |
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| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| argentite | (noun) a valuable silver ore consisting of silver sulfide (Ag2S) | - |
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| argillite | (noun) a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages | - |
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| arginine | (noun) a bitter tasting amino acid found in proteins and necessary for nutrition; its absence from the diet leads to a reduced production of spermatozoa | - |
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| arguer | (noun) someone who engages in debate | Synonyms: debater |
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| argument | (noun) a variable in a logical or mathematical expression whose value determines the dependent variable; if f(x)=y, x is the independent variable | - |
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| (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argumentation, line, line of reasoning, logical argument |
| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argumentation, debate |
| (noun) a summary of the subject or plot of a literary work or play or movie | Synonyms: literary argument |
| (noun) a fact or assertion offered as evidence that something is true | Synonyms: statement |
| (noun) a contentious speech act; a dispute where there is strong disagreement | Synonyms: arguing, contention, contestation, controversy, disceptation, disputation, tilt |
| (noun) (computer science) a reference or value that is passed to a function, procedure, subroutine, command, or program | Synonyms: parameter |
| argumentation | (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argument, line, line of reasoning, logical argument |
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| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argument, debate |
| argyle | (noun) a sock knitted or woven with an argyle design | Synonyms: argyll |
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| (noun) a design consisting of a pattern of varicolored diamonds on a solid background (originally for knitted articles); patterned after the tartan of a clan in western Scotland | Synonyms: argyll |
| (noun) a covered gravy holder of silver or other metal containing a detachable central vessel for hot water to keep the gravy warm | Synonyms: argyll |
| argyrodite | (noun) a rare steel-grey mineral consisting of silver and germanium and sulfur | - |
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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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| arietta | (noun) a short aria | Synonyms: short aria |
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| arithmetic | (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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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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| armament | (noun) the act of equipping with weapons in preparation for war | Synonyms: arming, equipping |
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| (noun) weaponry used by military or naval force | - |
| armamentarium | (noun) the collection of equipment and methods used in the practice of medicine | - |
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| armature | (noun) coil in which voltage is induced by motion through a magnetic field | - |
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| armet | (noun) a medieval helmet with a visor and a neck guard | - |
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| armhole | (noun) a hole through which you put your arm and where a sleeve can be attached | - |
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| armiger | (noun) a squire carrying the armor of a knight | Synonyms: armor-bearer |
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| (noun) a nobleman entitled to bear heraldic arms | - |
| armistice | (noun) a state of peace agreed to between opponents so they can discuss peace terms | Synonyms: cease-fire, truce |
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| armlet | (noun) a band worn around the arm for decoration | Synonyms: arm band |
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| armoire | (noun) a large wardrobe or cabinet; originally used for storing weapons | - |
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| armorer | (noun) a manufacturer of firearms | Synonyms: armourer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armourer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armourer |
| armourer | (noun) a manufacturer of firearms | Synonyms: armorer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armorer |
| armrest | (noun) a support for the arm | - |
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| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| arouser | (noun) someone who rouses others from sleep | Synonyms: rouser, waker |
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| arpeggio | (noun) a chord whose notes are played in rapid succession rather than simultaneously | - |
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| arpent | (noun) a former French unit of area; equal approximately to an acre | - |
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| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| arraignment | (noun) a legal document calling someone to court to answer an indictment | - |
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| arrangement | (noun) the act of arranging and adapting a piece of music | Synonyms: arranging, transcription |
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| (noun) the spatial property of the way in which something is placed | Synonyms: placement |
| (noun) an organized structure for arranging or classifying | Synonyms: organisation, organization, system |
| (noun) the thing arranged or agreed to | Synonyms: agreement |
| (noun) a piece of music that has been adapted for performance by a particular set of voices or instruments | Synonyms: musical arrangement |
| (noun) an orderly grouping (of things or persons) considered as a unit; the result of arranging | - |
| arranger | (noun) a person who brings order and organization to an enterprise | Synonyms: organiser, organizer |
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| (noun) a musician who adapts a composition for particular voices or instruments or for another style of performance | Synonyms: adapter, transcriber |
| 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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| arrivederci | (noun) a farewell remark | Synonyms: adieu, adios, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| arriver | (noun) someone who arrives (or has arrived) | Synonyms: arrival, comer |
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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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| arrogance | (noun) overbearing pride evidenced by a superior manner toward inferiors | Synonyms: haughtiness, hauteur, high-handedness, lordliness |
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| arrowhead | (noun) the pointed head or striking tip of an arrow | - |
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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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| artefact | (noun) a man-made object taken as a whole | Synonyms: artifact |
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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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| arteria | (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arterial blood vessel, artery |
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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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| arteriogram | (noun) an X ray of an artery filled with a contrast medium | - |
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| arteriography | (noun) roentgenographic examination of arteries | - |
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| arteriola | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriole, capillary artery |
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| arteriole | (noun) one of the small thin-walled arteries that end in capillaries | Synonyms: arteriola, capillary artery |
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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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| artery | (noun) a major thoroughfare that bears important traffic | - |
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| (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arteria, arterial blood vessel |
| artfulness | (noun) the quality of being adroit in taking unfair advantage | - |
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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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| arthromere | (noun) any of the segments in the body of a jointed animal like an arthropod | - |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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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 | - |
| artichoke | (noun) a thistlelike flower head with edible fleshy leaves and heart | Synonyms: globe artichoke |
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| (noun) Mediterranean thistlelike plant widely cultivated for its large edible flower head | Synonyms: artichoke plant, Cynara scolymus, globe artichoke |
| article | (noun) one of a class of artifacts | - |
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| (noun) nonfictional prose forming an independent part of a publication | - |
| (noun) (grammar) a determiner that may indicate the specificity of reference of a noun phrase | - |
| (noun) a separate section of a legal document (as a statute or contract or will) | Synonyms: clause |
| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| artifice | (noun) a deceptive maneuver (especially to avoid capture) | Synonyms: ruse |
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| artificer | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artisan, craftsman, journeyman |
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| (noun) someone who is the first to think of or make something | Synonyms: discoverer, inventor |
| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, armourer |
| artillery | (noun) large but transportable armament | Synonyms: gun, heavy weapon, ordnance |
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| (noun) a means of persuading or arguing | Synonyms: weapon |
| (noun) an army unit that uses big guns | Synonyms: artillery unit |
| artilleryman | (noun) a serviceman in the artillery | Synonyms: cannoneer, gunner, machine gunner |
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| artiste | (noun) a public performer (a dancer or singer) | - |
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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 |
| arytaenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytenoid, arytenoid cartilage |
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| arytenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytaenoid, arytenoid cartilage |
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