| alacritous | (adjective) quick and eager | - |
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| albuminous | (adjective) relating to or containing or resembling albumin | - |
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| alehouse | (noun) a tavern where ale is sold | - |
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| alliaceous | (adjective) of or pertaining to the botanical genus Allium | - |
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| (adjective) smelling of onions or garlic | - |
| allochthonous | (adjective) of rocks, deposits, etc.; found in a place other than where they and their constituents were formed | - |
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| allogamous | (adjective) relating to cross-fertilization in plants | - |
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| allomerous | (adjective) pertaining to allomerism | - |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| allusion | (noun) passing reference or indirect mention | - |
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| allusive | (adjective) characterized by indirect references | - |
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| allusiveness | (noun) a quality characterized by indirect reference | - |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| altitudinous | (adjective) indefinitely high; lofty | - |
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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| altostratus | (noun) a stratus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altostratus cloud |
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| aluminiferous | (adjective) containing alum or aluminum | - |
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| aluminous | (adjective) pertaining to or containing aluminum or alum | - |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |
| ambagious | (adjective) roundabout and unnecessarily wordy | Synonyms: circumlocutious, circumlocutory, periphrastic |
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| ambidextrous | (adjective) equally skillful with each hand | Synonyms: two-handed |
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| (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: deceitful, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambiguous | (adjective) having more than one possible meaning | - |
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| (adjective) open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead | Synonyms: equivocal |
| (adjective) having no intrinsic or objective meaning; not organized in conventional patterns | - |
| ambiguously | (adverb) in an ambiguous manner | Synonyms: equivocally |
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| ambitious | (adjective) having a strong desire for success or achievement | - |
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| (adjective) requiring full use of your abilities or resources | Synonyms: challenging |
| ambitiously | (adverb) with ambition; in an ambitious and energetic manner | Synonyms: determinedly |
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| ambitiousness | (noun) a strong drive for success | Synonyms: ambition |
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| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| (verb) wait in hiding to attack | Synonyms: ambush, bushwhack, lie in wait, lurk, scupper, waylay |
| ambush | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambuscade, lying in wait, trap |
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| (verb) wait in hiding to attack | Synonyms: ambuscade, bushwhack, lie in wait, lurk, scupper, waylay |
| (verb) hunt (quarry) by stalking and ambushing | Synonyms: still-hunt |
| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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| amebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amoeban, amoebic, amoebous |
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| amentaceous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentiferous |
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| amentiferous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentaceous |
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| ametabolous | (adjective) undergoing slight or no metamorphosis | Synonyms: ametabolic |
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| amoebous | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoeban, amoebic |
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| amorous | (adjective) inclined toward or displaying love | Synonyms: amative |
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| (adjective) expressive of or exciting sexual love or romance | Synonyms: amatory, romantic |
| amorously | (adverb) in an amorous manner | - |
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| amorousness | (noun) a feeling of love or fondness | Synonyms: enamoredness |
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| (noun) the arousal of feelings of sexual desire | Synonyms: amativeness, eroticism, erotism, sexiness |
| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| amorphous | (adjective) lacking the system or structure characteristic of living bodies | Synonyms: unstructured |
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| (adjective) without real or apparent crystalline form | Synonyms: uncrystallised, uncrystallized |
| (adjective) unclear because vague or badly organized | - |
| (adjective) having no definite form or distinct shape | Synonyms: formless, shapeless |
| (adjective) (of a group of people or an organization) unorganized or unfocused | - |
| amphibious | (adjective) operating or living on land and in water | - |
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| (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibian |
| amphioxus | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: lancelet |
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| amphitropous | (adjective) (of a plant ovule) partly inverted; turned back 90 degrees on its stalk | - |
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| amuse | (verb) make (somebody) laugh | - |
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| (verb) occupy in an agreeable, entertaining or pleasant fashion | Synonyms: disport, divert |
| amused | (adjective) pleasantly occupied | Synonyms: diverted, entertained |
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| amusement | (noun) an activity that is diverting and that holds the attention | Synonyms: entertainment |
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| (noun) a feeling of delight at being entertained | - |
| amusing | (adjective) arousing or provoking laughter | Synonyms: comic, comical, funny, laughable, mirthful, risible |
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| (adjective) providing enjoyment; pleasantly entertaining | Synonyms: amusive, diverting |
| amusingly | (adverb) in an entertaining and amusing manner | Synonyms: divertingly |
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| amusive | (adjective) providing enjoyment; pleasantly entertaining | Synonyms: amusing, diverting |
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| amylaceous | (adjective) resembling starch | Synonyms: amyloid, amyloidal, farinaceous, starchlike |
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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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| anadromous | (adjective) migrating from the sea to fresh water to spawn | - |
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| analogous | (adjective) corresponding in function but not in evolutionary origin | - |
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| (adjective) similar or equivalent in some respects though otherwise dissimilar | Synonyms: correspondent |
| analogously | (adverb) in an analogous manner | - |
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| anasarcous | (adjective) characterized by or affected by dropsy | - |
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| anatropous | (adjective) (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | Synonyms: inverted |
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| anchusa | (noun) any of various Old World herbs of the genus Anchusa having one-sided clusters of trumpet-shaped flowers | - |
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| androgenous | (adjective) of or related to androgenesis | Synonyms: androgenetic |
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| androgynous | (adjective) having both male and female characteristics | - |
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| (adjective) relating to or exhibiting both female and male sex organs but with a predominantly female appearance | - |
| anemophilous | (adjective) of flowering plants (especially grasses etc) that are pollinated by the wind | - |
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| anencephalous | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalic |
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| anestrous | (adjective) (of lower mammals) not in a state of estrus; not in heat | - |
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| (adjective) of or relating to anestrus | Synonyms: anestric, anoestrous |
| anestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anoestrum, anoestrus |
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| anfractuous | (adjective) full of twists and turns | - |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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| anginous | (adjective) of or related to the pain of angina pectoris | Synonyms: anginal, anginose |
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| angiocarpous | (adjective) having or being fruit enclosed in a shell or husk | Synonyms: angiocarpic |
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| angiomatous | (adjective) of or related to or having a tumor of the kind known as an angioma | - |
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| angiospermous | (adjective) of or related to or characteristic of plants that are angiosperms | - |
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| anhydrous | (adjective) without water; especially without water of crystallization | - |
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| animus | (noun) a feeling of ill will arousing active hostility | Synonyms: animosity, bad blood |
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| anisogamous | (adjective) relating to a type of sexual reproduction in which the gametes are dissimilar in some respect (as size or shape) | Synonyms: anisogamic |
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| ankus | (noun) an elephant goad with a sharp spike and a hook | - |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| 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 |
| anoestrous | (adjective) of or relating to anestrus | Synonyms: anestric, anestrous |
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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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| anomalous | (adjective) deviating from the general or common order or type | - |
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| anomalously | (adverb) in an anomalous manner | - |
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| anomalousness | (noun) deviation from the normal or common order or form or rule | Synonyms: anomaly |
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| anonymous | (adjective) having no known name or identity or known source | Synonyms: anon. |
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| (adjective) not known or lacking marked individuality | - |
| anonymously | (adverb) without giving a name | - |
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| anthophagous | (adjective) feeding on flowers | Synonyms: anthophilous |
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| anthophilous | (adjective) feeding on flowers | Synonyms: anthophagous |
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| anthropomorphous | (adjective) suggesting human characteristics for animals or inanimate things | Synonyms: anthropomorphic, humanlike |
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| anthropophagous | (adjective) of or relating to eaters of human flesh | - |
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| anthropophagus | (noun) a person who eats human flesh | Synonyms: anthropophagite, cannibal, man-eater |
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| antimonious | (adjective) relating to or derived from antimony | Synonyms: antimonic |
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| antireligiousness | (noun) The state or condition of being opposed to religion. | - |
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| antitrust | (adjective) of laws and regulations; designed to protect trade and commerce from unfair business practices | Synonyms: antimonopoly |
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| antitussive | (noun) any medicine used to suppress or relieve coughing | - |
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| antonymous | (adjective) of words: having opposite meanings | - |
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| anurous | (adjective) not having a tail | Synonyms: tailless |
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| anus | (noun) the excretory opening at the end of the alimentary canal | - |
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| anxious | (adjective) eagerly desirous | Synonyms: dying |
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| (adjective) causing or fraught with or showing anxiety | Synonyms: nervous, queasy, uneasy, unquiet |
| anxiously | (adverb) with anxiety or apprehension | Synonyms: apprehensively, uneasily |
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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 |
| 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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| apetalous | (adjective) (of flowers) having no petals | Synonyms: petalless |
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| aphyllous | (adjective) devoid of leaves | - |
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