| arborical | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborous |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arboriform | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arborise | (verb) branch out like trees | Synonyms: arborize |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborize | (verb) branch out like trees | Synonyms: arborise |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| archaeornis | (noun) extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing | - |
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| archespore | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archesporium |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archesporium | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archespore |
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| arciform | (adjective) forming or resembling an arch | Synonyms: arced, arched, arching, arcuate, bowed |
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| ardor | (noun) intense feeling of love | Synonyms: ardour |
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| (noun) a feeling of strong eagerness (usually in favor of a person or cause) | Synonyms: ardour, elan, zeal |
| (noun) feelings of great warmth and intensity | Synonyms: ardour, fervency, fervidness, fervor, fervour, fire |
| armor | (noun) tough more-or-less rigid protective covering of an animal or plant | Synonyms: armour |
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| (noun) protective covering made of metal and used in combat | Synonyms: armour |
| (noun) a military unit consisting of armored fighting vehicles | Synonyms: armour |
| (verb) equip with armor | Synonyms: armour |
| armored | (adjective) protected by armor (used of persons or things military) | Synonyms: armoured |
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| (adjective) used of animals; provided with protective covering | Synonyms: armoured |
| (adjective) equipped with the complete arms and armor of a warrior | Synonyms: panoplied |
| 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 |
| armorial | (adjective) of or relating to heraldry or heraldic arms | - |
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| armory | (noun) a place where arms are manufactured | Synonyms: armoury, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armoury, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armoury, arsenal |
| (noun) a collection of resources | Synonyms: armoury, inventory |
| armyworm | (noun) moth whose destructive larvae travel in multitudes | Synonyms: Pseudaletia unipuncta |
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| (noun) noctuid moth larvae that travel in multitudes destroying especially grass and grain | Synonyms: army worm, Pseudaletia unipuncta |
| (noun) larva of fungus gnat that feed on cereals and other grains; they march in large companies in regular order when the food is exhausted | - |
| arrogator | (noun) a person who through conceit makes pretentious claims to rights or advantages that he or she is not entitled to or to qualities that he or she does not possess | - |
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| arrowworm | (noun) any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth | Synonyms: chaetognath |
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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 | - |
| arthrosporic | (adjective) of or relating to arthrospores | Synonyms: arthrosporous |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| articulator | (noun) a movable speech organ | - |
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| (noun) someone who pronounces words | - |
| articulatory | (adjective) of or relating to articulation | Synonyms: articulative |
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| artwork | (noun) photographs or other visual representations in a printed publication | Synonyms: art, graphics, nontextual matter |
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| ascospore | (noun) sexually produced fungal spore formed within an ascus | - |
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| ascosporic | (adjective) of or relating to ascospores | Synonyms: ascosporous |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| ashore | (adverb) towards the shore from the water | - |
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| aspersorium | (noun) the basin or other vessel that holds holy water in Roman Catholic Churches | - |
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| (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspergill |
| asphyxiator | (noun) a manually operated device for extinguishing small fires | Synonyms: extinguisher, fire extinguisher |
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| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| assassinator | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassin, bravo |
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| assessor | (noun) an official who evaluates property for the purpose of taxing it | Synonyms: tax assessor |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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| assignor | (noun) (law) the party who makes an assignment | - |
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| assimilator | (noun) someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs | Synonyms: learner, scholar, student |
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| assimilatory | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilative |
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| associatory | (adjective) characterized by or causing or resulting from the process of bringing ideas or events together in memory or imagination | Synonyms: associative |
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| assort | (verb) arrange or order by classes or categories | Synonyms: class, classify, separate, sort, sort out |
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| (verb) keep company with; hang out with | Synonyms: affiliate, associate, consort |
| assorted | (adjective) of many different kinds purposefully arranged but lacking any uniformity | Synonyms: various |
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| (adjective) consisting of a haphazard assortment of different kinds | Synonyms: miscellaneous, mixed, motley, sundry |
| assortment | (noun) the act of distributing things into classes or categories of the same type | Synonyms: categorisation, categorization, classification, compartmentalisation, compartmentalization |
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| (noun) a collection containing a variety of sorts of things | Synonyms: miscellanea, miscellany, mixed bag, mixture, motley, potpourri, salmagundi, smorgasbord, variety |
| astrogator | (noun) the navigator of a spacecraft | - |
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| athanor | (noun) a furnace that feeds itself so as to maintain a uniform temperature; used by alchemists | - |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| atorvastatin | (noun) an oral drug (trade name Lipitor) that is effective in lowering triglycerides; potent in reducing LDL cholesterol because higher doses can be given | Synonyms: Lipitor |
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| attenuator | (noun) an electrical device for attenuating the strength of an electrical signal | - |
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| attestator | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestor, witness |
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| attestor | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestator, witness |
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| attorn | (verb) acknowledge a new land owner as one's landlord | - |
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| attorney | (noun) a professional person authorized to practice law; conducts lawsuits or gives legal advice | Synonyms: lawyer |
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| attorneyship | (noun) the position of attorney | - |
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| attractor | (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attraction, attractive feature, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attracter |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attraction, draw, drawing card |
| auctorial | (adjective) of or by or typical of an author | Synonyms: authorial |
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| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| auditory | (adjective) of or relating to the process of hearing | Synonyms: audile, auditive |
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| auriform | (adjective) having a shape resembling an ear | Synonyms: ear-like, ear-shaped |
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| aurora | (noun) an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force | - |
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| (noun) the first light of day | Synonyms: break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise, sunup |
| auroral | (adjective) characteristic of the dawn | Synonyms: aurorean |
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| (adjective) of or relating to the atmospheric phenomenon auroras | - |
| aurorean | (adjective) characteristic of the dawn | Synonyms: auroral |
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| auscultatory | (adjective) of or relating to auscultation | - |
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| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| author | (noun) writes (books or stories or articles or the like) professionally (for pay) | Synonyms: writer |
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| (noun) someone who originates or causes or initiates something | Synonyms: generator, source |
| (verb) be the author of | - |
| authoress | (noun) a woman author | - |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| authorise | (verb) grant authorization or clearance for | Synonyms: authorize, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorize, empower |
| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authoritatively | (adverb) in an authoritative and magisterial manner | Synonyms: magisterially |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| authorize | (verb) grant authorization or clearance for | Synonyms: authorise, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorise, empower |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| authorship | (noun) the act of creating written works | Synonyms: composition, penning, writing |
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| (noun) the act of initiating a new idea or theory or writing | Synonyms: paternity |
| autocorrect | (noun) a system for automatically correcting text | - |
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| autofluorescence | (noun) self-induced fluorescence | - |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| autoinjector | (noun) a hypodermic syringe to use in injecting yourself with a liquid | - |
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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| autoregulation | (noun) (physiology) processes that maintain a generally constant physiological state in a cell or organism | - |
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| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| awlwort | (noun) small aquatic plant having tufted awl-shaped leaves in a basal rosette and minute white flowers; circumboreal | Synonyms: Subularia aquatica |
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| baccivorous | (adjective) feeding on berries | - |
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| bachelor | (noun) a man who has never been married | Synonyms: unmarried man |
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| (noun) a knight of the lowest order; could display only a pennon | Synonyms: bachelor-at-arms, knight bachelor |
| (verb) lead a bachelor's existence | Synonyms: bach |
| bachelorette | (noun) a young unmarried woman who lives alone | Synonyms: bachelor girl |
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