| announcer | (noun) reads news, commercials on radio or television | - |
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| (noun) someone who proclaims a message publicly | - |
| annual | (noun) a reference book that is published regularly once every year | Synonyms: yearbook, yearly |
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| (noun) (botany) a plant that completes its entire life cycle within the space of a year | - |
| annualry | (noun) the third finger (especially of the left hand) | Synonyms: ring finger |
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| annuitant | (noun) the recipient of an annuity | - |
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| annuity | (noun) income from capital investment paid in a series of regular payments | Synonyms: rente |
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| annulet | (noun) molding in the form of a ring; at top of a column | Synonyms: bandelet, bandelette, bandlet, square and rabbet |
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| (noun) (heraldry) a charge in the shape of a small ring | - |
| annulment | (noun) (law) a formal termination (of a relationship or a judicial proceeding etc) | Synonyms: invalidation |
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| (noun) the act of abrogating; an official or legal cancellation | Synonyms: abrogation, repeal |
| (noun) the state of being cancelled or annulled | Synonyms: revocation |
| annulus | (noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar | Synonyms: skirt |
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| (noun) a toroidal shape | Synonyms: anchor ring, doughnut, halo, ring |
| annum | (noun) (Latin) year | - |
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| annunciation | (noun) a formal public statement | Synonyms: announcement, declaration, proclamation |
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| annunciator | (noun) an indicator that announces which electrical circuit has been active (as on a telephone switchboard) | - |
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| anoestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrus |
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| anoestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrum |
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| anomalousness | (noun) deviation from the normal or common order or form or rule | Synonyms: anomaly |
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| anovulant | (noun) a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception | Synonyms: anovulatory drug, birth control pill, contraceptive pill, oral contraceptive, oral contraceptive pill, pill |
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| anovulation | (noun) the absence of ovulation due to immaturity or post-maturity or pregnancy or oral contraceptive pills or dysfunction of the ovary | - |
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| antediluvian | (noun) a very old person | Synonyms: ancient |
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| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| antepenult | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenultima, antepenultimate |
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| antepenultima | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultimate |
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| antepenultimate | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultima |
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| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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| anthropophagus | (noun) a person who eats human flesh | Synonyms: anthropophagite, cannibal, man-eater |
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| anthurium | (noun) any of various tropical American plants cultivated for their showy foliage and flowers | Synonyms: tail-flower, tailflower |
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| anticoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant medication, decoagulant |
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| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| anticonvulsant | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant drug, antiepileptic, antiepileptic drug |
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| antidiuretic | (noun) a drug that limits the formation of urine | Synonyms: antidiuretic drug |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| antifungal | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal agent, antimycotic, antimycotic agent, fungicide |
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| antimuon | (noun) the antiparticle of a muon; decays to positron and neutrino and antineutrino | Synonyms: positive muon |
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| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| antipruritic | (noun) a substance that relieves or prevents itching | - |
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| antiquarian | (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
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| antiquark | (noun) the antiparticle of a quark | - |
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| antiquary | (noun) an expert or collector of antiquities | Synonyms: antiquarian, archaist |
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| antiquatedness | (noun) The state or quality of being outmoded or discredited by reason of age, of being out of style or fashion. | - |
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| antique | (noun) any piece of furniture or decorative object or the like produced in a former period and valuable because of its beauty or rarity | - |
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| (noun) an elderly man | Synonyms: gaffer, old-timer, old geezer, oldtimer |
| antiqueness | (noun) the quality or state of being in the style or fashion of former times. | - |
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| antiquity | (noun) an artifact surviving from the past | - |
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| (noun) extreme oldness | Synonyms: ancientness |
| (noun) the historic period preceding the Middle Ages in Europe | - |
| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antiserum | (noun) blood serum containing antibodies against specific antigens; provides immunity to a disease | - |
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| antitauon | (noun) an antilepton of very great mass | Synonyms: tau-plus particle |
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| antitussive | (noun) any medicine used to suppress or relieve coughing | - |
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| antrum | (noun) a natural cavity or hollow in a bone | - |
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| anuran | (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: batrachian, frog, salientian, toad, toad frog |
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| anuresis | (noun) inability to urinate | Synonyms: anuria |
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| anuria | (noun) inability to urinate | Synonyms: anuresis |
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| anus | (noun) the excretory opening at the end of the alimentary canal | - |
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| anxiousness | (noun) a feeling of mild anxiety about possible developments | Synonyms: disquiet |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiety |
| aoudad | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, arui, audad, Barbary sheep, maned sheep |
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| apatosaur | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaurus, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apercu | (noun) a short synopsis | - |
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| aperture | (noun) an man-made opening; usually small | - |
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| (noun) a device that controls amount of light admitted | - |
| (noun) a natural opening in something | - |
| apiculture | (noun) the cultivation of bees on a commercial scale for the production of honey | Synonyms: beekeeping |
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| apiculturist | (noun) a farmer who keeps bees for their honey | Synonyms: apiarist, beekeeper |
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| apologue | (noun) a short moral story (often with animal characters) | Synonyms: allegory, fable, parable |
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| apolune | (noun) apoapsis in orbit around the moon | Synonyms: aposelene |
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| aponeurosis | (noun) any of the deeper and thicker fascia that attach muscles to bones; resemble flattened tendons | - |
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| apothecium | (noun) a cuplike ascocarp in many lichens and ascomycetous fungi | - |
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| apparatus | (noun) equipment designed to serve a specific function | Synonyms: setup |
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| (noun) (anatomy) a group of body parts that work together to perform a given function | - |
| appendicularia | (noun) free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates | - |
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| applauder | (noun) someone who applauds | Synonyms: clapper |
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| applause | (noun) a demonstration of approval by clapping the hands together | Synonyms: clapping, hand clapping |
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| applesauce | (noun) nonsensical talk or writing | Synonyms: codswallop, folderol, rubbish, trash, tripe, trumpery, wish-wash |
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| (noun) puree of stewed apples usually sweetened and spiced | Synonyms: apple sauce |
| applique | (noun) a decorative design made of one material sewn over another | - |
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| appoggiatura | (noun) an embellishing note usually written in smaller size | Synonyms: acciaccatura, grace note |
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| appurtenance | (noun) a supplementary component that improves capability | Synonyms: accessory, add-on, supplement |
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| (noun) equipment consisting of miscellaneous articles needed for a particular operation or sport etc. | Synonyms: gear, paraphernalia |
| aptitude | (noun) inherent ability | - |
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| aqua | (noun) a shade of blue tinged with green | Synonyms: aquamarine, cobalt blue, greenish blue, peacock blue, turquoise |
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| aquaculture | (noun) rearing aquatic animals or cultivating aquatic plants for food | - |
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| aqualung | (noun) a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus | Synonyms: Aqua-Lung, scuba |
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| aquamarine | (noun) a shade of blue tinged with green | Synonyms: aqua, cobalt blue, greenish blue, peacock blue, turquoise |
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| (noun) a transparent variety of beryl that is blue green in color | - |
| aquanaut | (noun) an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder | Synonyms: skin-diver |
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| (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: oceanaut |
| aquaphobia | (noun) a morbid fear of drowning | - |
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| aquaplane | (noun) a board that is pulled by a speedboat as a person stands on it and skims over the top of the water | - |
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| aquarium | (noun) a tank or pool or bowl filled with water for keeping live fish and underwater animals | Synonyms: fish tank, marine museum |
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| aquatic | (noun) a plant that lives in or on water | - |
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| aquatics | (noun) sports that involve bodies of water | Synonyms: water sport |
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| aquatint | (noun) a method of etching that imitates the broad washes of a water color | - |
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| (noun) an etching made by a process that makes it resemble a water color | - |
| aquavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: akvavit |
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| aqueduct | (noun) a conduit that resembles a bridge but carries water over a valley | - |
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| aquiculture | (noun) a technique of growing plants (without soil) in water containing dissolved nutrients | Synonyms: hydroponics, tank farming |
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| aquifer | (noun) underground bed or layer yielding ground water for wells and springs etc | - |
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| aquilege | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilegia, columbine |
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| aquilegia | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, columbine |
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| arabesque | (noun) an ornament that interlaces simulated foliage in an intricate design | - |
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| (noun) position in which the dancer has one leg raised behind and arms outstretched in a conventional pose | - |
| araucaria | (noun) any of several tall South American or Australian trees with large cones and edible seeds | - |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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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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| 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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| arbour | (noun) a framework that supports climbing plants | Synonyms: arbor, bower, pergola |
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| arbovirus | (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: arborvirus |
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| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| arcanum | (noun) information known only to a special group | Synonyms: secret |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archduchess | (noun) a wife or widow of an archduke or a princess of the former ruling house of Austria | - |
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