| 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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| arsenious | (adjective) relating to compounds in which arsenic is trivalent | - |
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| arteriovenous | (adjective) connecting an artery to a vein | - |
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| 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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| artiodactylous | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactyl, even-toed |
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| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ascomycetous | (adjective) related to or characteristic of fungi of the class Ascomycetes | - |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| assiduous | (adjective) marked by care and persistent effort | Synonyms: sedulous |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atrabilious | (adjective) irritable as if suffering from indigestion | Synonyms: bilious, dyspeptic, liverish |
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| atrocious | (adjective) provoking horror | Synonyms: frightful, horrible, horrifying, ugly |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, awful, dreadful, painful, terrible, unspeakable |
| (adjective) shockingly brutal or cruel | Synonyms: flagitious, grievous, monstrous |
| audacious | (adjective) disposed to venture or take risks | Synonyms: daring, venturesome, venturous |
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| (adjective) invulnerable to fear or intimidation | Synonyms: brave, dauntless, fearless, hardy, intrepid, unfearing |
| (adjective) unrestrained by convention or propriety | Synonyms: bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen, insolent |
| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| aurous | (adjective) of or relating to or containing or derived from gold | Synonyms: auric |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| autoecious | (adjective) of parasites especially rust fungi; completing the entire life cycle on a single host | Synonyms: homoecious |
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| autogamous | (adjective) characterized by or fit for autogamy | Synonyms: autogamic |
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| autogenous | (adjective) originating within the body | Synonyms: autogenic |
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| autoicous | (adjective) having male and female reproductive organs in separate clusters on the same plant | - |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| avaricious | (adjective) immoderately desirous of acquiring e.g. wealth | Synonyms: covetous, grabby, grasping, greedy, prehensile |
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| azygous | (adjective) occurring singly; not one of a pair | Synonyms: azygos |
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| bacciferous | (adjective) producing or bearing berries | Synonyms: baccate, berried |
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| baccivorous | (adjective) feeding on berries | - |
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| bacteriophagous | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagic |
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| barbarous | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: brutal, cruel, fell, roughshod, savage, vicious |
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| (adjective) primitive in customs and culture | - |
| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| beauteous | (adjective) (poetic) beautiful, especially to the sight | - |
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| betulaceous | (adjective) of or pertaining to or characteristic of trees of the birch family | - |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibulous | (adjective) given to or marked by the consumption of alcohol | Synonyms: boozy, drunken, sottish |
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| bicephalous | (adjective) having two heads | - |
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| bicornuous | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicornate, bicorned, bicornuate |
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| bigamous | (adjective) of illegal marriage to a second person while legally married to a first | - |
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| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| bilious | (adjective) relating to or containing bile | Synonyms: biliary |
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| (adjective) irritable as if suffering from indigestion | Synonyms: atrabilious, dyspeptic, liverish |
| (adjective) suffering from or suggesting a liver disorder or gastric distress | Synonyms: liverish, livery |
| biogenous | (adjective) producing or produced by living things | - |
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| biparous | (adjective) producing two offspring at a time | Synonyms: twinning |
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| biramous | (adjective) resembling a fork; divided or separated into two branches | Synonyms: bifurcate, branched, forficate, fork-like, forked, pronged, prongy |
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| bituminous | (adjective) resembling or containing bitumen | - |
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| blasphemous | (adjective) characterized by profanity or cursing | Synonyms: blue, profane |
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| (adjective) grossly irreverent toward what is held to be sacred | Synonyms: profane, sacrilegious |
| blusterous | (adjective) blowing in violent and abrupt bursts | Synonyms: blustering, blustery |
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| bodacious | (adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, barefaced, brassy, brazen-faced, brazen, insolent |
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| (adjective) incorrigible | - |
| boisterous | (adjective) noisy and lacking in restraint or discipline | Synonyms: rambunctious, robustious, rumbustious, unruly |
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| (adjective) full of rough and exuberant animal spirits | Synonyms: knockabout |
| (adjective) violently agitated and turbulent | Synonyms: fierce, rough |
| bounteous | (adjective) given or giving freely | Synonyms: big, bighearted, bountiful, freehanded, giving, handsome, liberal, openhanded |
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| brachiopodous | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopod |
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| brachydactylous | (adjective) having abnormally short finger or toes | Synonyms: brachydactylic |
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| brachypterous | (adjective) (especially of certain insects) having very short or rudimentary wings | Synonyms: short-winged |
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| brachyurous | (adjective) of or belonging to the suborder Brachyura | - |
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| branchiopodous | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopod, branchiopodan |
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| brumous | (adjective) filled or abounding with fog or mist | Synonyms: foggy, hazy, misty |
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| bulbaceous | (adjective) producing or growing from bulbs | - |
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| bulbous | (adjective) curving outward | Synonyms: bellied, bellying, bulging, bulgy, protuberant |
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| (adjective) shaped like a bulb | Synonyms: bulb-shaped, bulblike |
| bumptious | (adjective) offensively self-assertive | Synonyms: self-assertive |
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| burglarious | (adjective) involving or resembling burglary | - |
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| butyraceous | (adjective) having the qualities of butter or yielding or containing a substance like butter | - |
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| cacophonous | (adjective) having an unpleasant sound | Synonyms: cacophonic |
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| cadaverous | (adjective) of or relating to a cadaver or corpse | Synonyms: cadaveric |
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| (adjective) very thin especially from disease or hunger or cold | Synonyms: emaciated, gaunt, haggard, pinched, skeletal, wasted |
| caducous | (adjective) shed at an early stage of development | Synonyms: shed |
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| calamitous | (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, disastrous, fatal, fateful |
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| calcareous | (adjective) composed of or containing or resembling calcium carbonate or calcite or chalk | Synonyms: chalky |
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| calcicolous | (adjective) growing or living in soil rich in lime | - |
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| calciferous | (adjective) bearing or producing or containing calcium or calcium carbonate or calcite | - |
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| calcifugous | (adjective) growing or living in acid soil | - |
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| calculous | (adjective) relating to or caused by or having a calculus or calculi | - |
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| caliginous | (adjective) dark and misty and gloomy | - |
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| callipygous | (adjective) pertaining to or having finely developed buttocks | Synonyms: callipygian |
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| callous | (adjective) emotionally hardened | Synonyms: indurate, pachydermatous |
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| (adjective) having calluses; having skin made tough and thick through wear | Synonyms: calloused, thickened |
| calumnious | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, defamatory, denigrating, denigrative, denigratory, libellous, libelous, slanderous |
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| camphoraceous | (adjective) being or having the properties of camphor | - |
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| campylotropous | (adjective) (of a plant ovule) curved with the micropyle near the base almost touching its stalk | - |
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| cancellous | (adjective) having an open or latticed or porous structure | Synonyms: cancellate, cancellated |
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| cancerous | (adjective) like a cancer; an evil that grows and spreads | - |
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| (adjective) relating to or affected with cancer | - |
| cankerous | (adjective) having an ulcer or canker | Synonyms: ulcerated, ulcerous |
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| canorous | (adjective) richly melodious | Synonyms: songful |
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| cantankerous | (adjective) having a difficult and contrary disposition | Synonyms: crotchety, ornery |
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| (adjective) stubbornly obstructive and unwilling to cooperate | Synonyms: bloody-minded |
| capacious | (adjective) large in capacity | - |
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| capricious | (adjective) determined by chance or impulse or whim rather than by necessity or reason | Synonyms: impulsive, whimsical |
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| (adjective) changeable | Synonyms: freakish |
| captious | (adjective) tending to find and call attention to faults | Synonyms: faultfinding |
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| carbonaceous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonic, carboniferous, carbonous |
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| carboniferous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonaceous, carbonic, carbonous |
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| (adjective) of or relating to the Carboniferous geologic era | - |
| carbonous | (adjective) relating to or consisting of or yielding carbon | Synonyms: carbonaceous, carbonic, carboniferous |
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| carcinomatous | (adjective) being or relating to carcinoma | - |
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| carious | (adjective) (of teeth) affected with cavities or decay | - |
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| carnivorous | (adjective) (used of plants as well as animals) feeding on animals | - |
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| (adjective) relating to or characteristic of carnivores | - |
| carpophagous | (adjective) feeding on fruit | Synonyms: fruit-eating |
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| carposporous | (adjective) having carpospores | - |
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| cartilaginous | (adjective) of or relating to cartilage | - |
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| (adjective) difficult to chew | Synonyms: gristly, rubbery |