| angiospermous | (adjective) of or related to or characteristic of plants that are angiosperms | - |
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| anguine | (adjective) of or related to or resembling a snake | - |
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| anguished | (adjective) experiencing intense pain especially mental pain | Synonyms: tormented, tortured |
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| angular | (adjective) having angles or an angular shape | Synonyms: angulate |
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| (adjective) measured by an angle or by the rate of change of an angle | - |
| angulate | (adjective) having angles or an angular shape | Synonyms: angular |
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| anhydrous | (adjective) without water; especially without water of crystallization | - |
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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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| announced | (adjective) declared publicly; made widely known | Synonyms: proclaimed |
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| annual | (adjective) completing its life cycle within a year | Synonyms: one-year |
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| (adjective) occurring or payable every year | Synonyms: yearly |
| annular | (adjective) shaped like a ring | Synonyms: annulate, annulated, circinate, doughnut-shaped, ring-shaped, ringed |
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| annulate | (adjective) shaped like a ring | Synonyms: annular, annulated, circinate, doughnut-shaped, ring-shaped, ringed |
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| annulated | (adjective) shaped like a ring | Synonyms: annular, annulate, circinate, doughnut-shaped, ring-shaped, ringed |
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| annunciatory | (adjective) relating to the act of announcing or being announced | - |
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| anoestrous | (adjective) of or relating to anestrus | Synonyms: anestric, anestrous |
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| anomalous | (adjective) deviating from the general or common order or type | - |
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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 | - |
| antebellum | (adjective) belonging to a period before a war especially the American Civil War | - |
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| antecubital | (adjective) of or relating to the region of the arm in front of the elbow | - |
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| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| antenuptial | (adjective) relating to events before a marriage | Synonyms: premarital, prenuptial |
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| antepartum | (adjective) occurring or existing before birth | Synonyms: antenatal, prenatal |
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| antepenultimate | (adjective) third from last | - |
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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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| antiauthoritarian | (adjective) opposed to authoritarianism | - |
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| anticoagulative | (adjective) of or relating to an anticoagulant | - |
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| antifungal | (adjective) capable of destroying fungi | Synonyms: fungicidal |
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| antimonious | (adjective) relating to or derived from antimony | Synonyms: antimonic |
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| antipollution | (adjective) intended to reduce pollution | - |
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| antiquarian | (adjective) of or relating to antiques or antiquities | - |
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| (adjective) of or relating to persons who study or deal in antiques or antiquities | - |
| antiquated | (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, archaic |
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| antique | (adjective) made in or typical of earlier times and valued for its age | - |
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| (adjective) out of fashion | Synonyms: demode, ex, old-fashioned, old-hat, outmoded, passe, passee |
| (adjective) belonging to or lasting from times long ago | Synonyms: age-old |
| antisubmarine | (adjective) defensive against enemy submarines | - |
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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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| antitumor | (adjective) used in the treatment of cancer | Synonyms: anticancer, antineoplastic, antitumour |
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| antitumour | (adjective) used in the treatment of cancer | Synonyms: anticancer, antineoplastic, antitumor |
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| antonymous | (adjective) of words: having opposite meanings | - |
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| anuran | (adjective) relating to frogs and toads | Synonyms: batrachian, salientian |
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| anuretic | (adjective) of or relating to an inability to urinate | Synonyms: anuric |
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| anuric | (adjective) of or relating to an inability to urinate | Synonyms: anuretic |
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| anurous | (adjective) not having a tail | Synonyms: tailless |
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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 |
| apetalous | (adjective) (of flowers) having no petals | Synonyms: petalless |
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| aphyllous | (adjective) devoid of leaves | - |
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| apiculate | (adjective) (of a leaf shape) having a short sharply pointed tip | - |
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| apicultural | (adjective) relating to the care and breeding of bees | - |
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| apivorous | (adjective) feeding on bees | - |
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| apocarpous | (adjective) (of ovaries of flowering plants) consisting of carpels that are free from one another as in buttercups or roses | - |
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| apocynaceous | (adjective) of or relating to tropical plants of the family Apocynaceae | - |
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| apodous | (adjective) (of snakes and eels) naturally footless | Synonyms: apodal |
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| apogamous | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogametic, apogamic |
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| aponeurotic | (adjective) of or relating to an aponeurosis | - |
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| appendicular | (adjective) relating to or consisting of an appendage or appendages; especially the limbs | - |
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| applaudable | (adjective) worthy of high praise | Synonyms: commendable, laudable, praiseworthy |
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| appurtenant | (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, ancillary, auxiliary |
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| apterous | (adjective) (of insects) without wings | Synonyms: apteral |
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| aptitudinal | (adjective) of or relating to aptitudes | - |
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| aquacultural | (adjective) of or relating to aquiculture | Synonyms: aquicultural, hydroponic |
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| aquaphobic | (adjective) abnormally afraid of water | Synonyms: hydrophobic |
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| aquatic | (adjective) operating or living or growing in water | - |
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| (adjective) relating to or consisting of or being in water | - |
| aqueous | (adjective) produced by the action of water | Synonyms: sedimentary |
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| (adjective) similar to or containing or dissolved in water | - |
| aquicultural | (adjective) of or relating to aquiculture | Synonyms: aquacultural, hydroponic |
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| aquiferous | (adjective) of or relating to an aquifer | - |
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| aquiline | (adjective) curved down like an eagle's beak | Synonyms: hooked |
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| araceous | (adjective) relating to a plant of the family Araceae | Synonyms: aroid |
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| arboraceous | (adjective) abounding in trees | Synonyms: arboreous, woodsy, woody |
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| arboreous | (adjective) inhabiting or frequenting trees | Synonyms: arboreal, tree-living |
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| (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| (adjective) abounding in trees | Synonyms: arboraceous, woodsy, woody |
| arboresque | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
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| arborous | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborical |
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| archducal | (adjective) belonging to or befitting an archduke or his archduchy | - |
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| architectural | (adjective) of or pertaining to the art and science of architecture | - |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| arcuate | (adjective) forming or resembling an arch | Synonyms: arced, arched, arching, arciform, bowed |
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| arduous | (adjective) difficult to accomplish; demanding considerable mental effort and skill | - |
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| (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
| (adjective) taxing to the utmost; testing powers of endurance | Synonyms: straining, strenuous |
| arenaceous | (adjective) resembling or containing or abounding in sand; or growing in sandy areas | Synonyms: sandlike, sandy |
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| arenicolous | (adjective) growing or living or burrowing in sand | - |
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| argentiferous | (adjective) containing or yielding silver | - |
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| argentous | (adjective) relating to compounds in which silver is univalent | - |
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| argillaceous | (adjective) resembling or containing clay | Synonyms: clayey |
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| arguable | (adjective) open to argument or debate | Synonyms: debatable, disputable, moot |
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| (adjective) capable of being supported by argument | - |
| argumentative | (adjective) given to or characterized by argument | - |
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| armoured | (adjective) protected by armor (used of persons or things military) | Synonyms: armored |
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| (adjective) used of animals; provided with protective covering | Synonyms: armored |
| aroused | (adjective) (of persons) excessively affected by emotion | Synonyms: emotional, excited, worked up |
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| (adjective) aroused to action | - |
| (adjective) emotionally aroused | Synonyms: stimulated, stirred, stirred up |
| (adjective) keenly excited (especially sexually) or indicating excitement | Synonyms: ablaze, aflame |
| (adjective) feeling great sexual desire | Synonyms: horny, randy, ruttish, steamy, turned on |
| (adjective) brought to a state of great tension | Synonyms: wound up |
| arsenious | (adjective) relating to compounds in which arsenic is trivalent | - |
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| artefactual | (adjective) of or relating to artifacts | Synonyms: artifactual |
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| arteriovenous | (adjective) connecting an artery to a vein | - |
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| artful | (adjective) marked by skill in achieving a desired end especially with cunning or craft | - |
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| (adjective) not straightforward or candid; giving a false appearance of frankness | Synonyms: disingenuous |
| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| articular | (adjective) relating to or affecting the joints of the body | Synonyms: articulary |
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| articulary | (adjective) relating to or affecting the joints of the body | Synonyms: articular |
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| articulate | (adjective) expressing yourself easily or characterized by clear expressive language | - |
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| (adjective) consisting of segments held together by joints | Synonyms: articulated |
| articulated | (adjective) consisting of segments held together by joints | Synonyms: articulate |
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| articulative | (adjective) of or relating to articulation | Synonyms: articulatory |
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| articulatory | (adjective) of or relating to articulation | Synonyms: articulative |
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| artifactual | (adjective) of or relating to artifacts | Synonyms: artefactual |
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| artiodactylous | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactyl, even-toed |
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