| abranchial | (adjective) having no gills | Synonyms: abranchiate, abranchious, gill-less |
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| abranchiate | (adjective) having no gills | Synonyms: abranchial, abranchious, gill-less |
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| abranchious | (adjective) having no gills | Synonyms: abranchial, abranchiate, gill-less |
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| abroach | (adjective) of a cask or barrel | Synonyms: broached |
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| achenial | (adjective) pertaining to dry one-seeded indehiscent fruit | - |
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| achievable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, doable, manageable, realizable |
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| aching | (adjective) causing a dull and steady pain | Synonyms: achy |
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| achlamydeous | (adjective) not having a floral envelope or perianth | - |
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| achlorhydric | (adjective) lacking hydrochloric acid | - |
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| achondritic | (adjective) not having a granular structure | - |
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| (adjective) of or related to an achondrite | - |
| achondroplastic | (adjective) of or relating to achondroplasia | - |
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| achromatic | (adjective) having no hue | Synonyms: neutral |
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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| achromatous | (adjective) having little or inadequate color | - |
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| achromic | (adjective) having no color | Synonyms: achromous |
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| achromous | (adjective) having no color | Synonyms: achromic |
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| achy | (adjective) causing a dull and steady pain | Synonyms: aching |
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| aeromechanic | (adjective) of or pertaining to aerodynamics | - |
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| alchemic | (adjective) related to or concerned with alchemy | Synonyms: alchemical |
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| alchemical | (adjective) related to or concerned with alchemy | Synonyms: alchemic |
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| alchemistic | (adjective) of or relating to alchemists | Synonyms: alchemistical |
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| alchemistical | (adjective) of or relating to alchemists | Synonyms: alchemistic |
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| allochronic | (adjective) (of taxa) occurring in different geologic times | - |
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| allochthonous | (adjective) of rocks, deposits, etc.; found in a place other than where they and their constituents were formed | - |
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| anachronic | (adjective) chronologically misplaced | Synonyms: anachronistic, anachronous |
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| anachronistic | (adjective) chronologically misplaced | Synonyms: anachronic, anachronous |
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| anachronous | (adjective) chronologically misplaced | Synonyms: anachronic, anachronistic |
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| anarchic | (adjective) without law or control | Synonyms: anarchical, lawless |
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| anarchical | (adjective) without law or control | Synonyms: anarchic, lawless |
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| anarchistic | (adjective) of or related to anarchism or tending toward anarchism | - |
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| anchoritic | (adjective) characterized by ascetic solitude | Synonyms: eremitic, eremitical, hermitic, hermitical |
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| anechoic | (adjective) not having or producing echoes; sound-absorbent | - |
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| anticholinergic | (adjective) inhibiting or blocking the action of acetylcholine at a receptor site | - |
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| apochromatic | (adjective) corrected for both chromatic and spherical aberration | - |
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| approachable | (adjective) easy to meet or converse or do business with | - |
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| (adjective) easily approached | Synonyms: reachable |
| (adjective) capable of being read with comprehension | Synonyms: accessible |
| approaching | (adjective) of the relatively near future | Synonyms: coming, forthcoming, upcoming |
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| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| arachnoid | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnidian, spiderlike, spiderly, spidery |
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| arch | (adjective) naughtily or annoyingly playful | Synonyms: impish, implike, mischievous, pixilated, prankish, puckish, wicked |
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| (adjective) (used of behavior or attitude) characteristic of those who treat others with condescension | Synonyms: condescending, patronising, patronizing |
| archaean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archean |
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| archaeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeological, archeologic, archeological |
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| archaeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archeologic, archeological |
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| archaeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archeozoic |
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| archaic | (adjective) little evolved from or characteristic of an earlier ancestral type | Synonyms: primitive |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, antiquated |
| archaistic | (adjective) imitative of an archaic style or manner | - |
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| archangelic | (adjective) of or relating to or resembling archangels | Synonyms: archangelical |
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| archangelical | (adjective) of or relating to or resembling archangels | Synonyms: archangelic |
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| archdiocesan | (adjective) of or relating to an archdiocese | - |
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| archducal | (adjective) belonging to or befitting an archduke or his archduchy | - |
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| archean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archaean |
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| arched | (adjective) constructed with or in the form of an arch or arches | - |
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| (adjective) forming or resembling an arch | Synonyms: arced, arching, arciform, arcuate, bowed |
| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archegoniate | (adjective) of or relating to an archegonium | Synonyms: archegonial |
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| archeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeological |
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| archeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeologic |
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| archeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archaeozoic |
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| archepiscopal | (adjective) of or associated with an archbishop | Synonyms: archiepiscopal |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archetypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypical, prototypal, prototypic, prototypical |
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| archetypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, prototypal, prototypic, prototypical |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| archiepiscopal | (adjective) of or associated with an archbishop | Synonyms: archepiscopal |
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| arching | (adjective) forming or resembling an arch | Synonyms: arced, arched, arciform, arcuate, bowed |
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| archipelagic | (adjective) relating to or part of an archipelago | - |
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| architectonic | (adjective) of or pertaining to construction or architecture | Synonyms: tectonic |
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| architectural | (adjective) of or pertaining to the art and science of architecture | - |
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| archival | (adjective) of or relating to or contained in or serving as an archive | - |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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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 | - |
| attachable | (adjective) capable of being fastened or added to something else | - |
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| attached | (adjective) associated in an exclusive sexual relationship | Synonyms: committed |
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| (adjective) used of buildings joined by common sidewalls | - |
| (adjective) fond and affectionate | - |
| (adjective) being joined in close association | Synonyms: affiliated, connected |
| autarchic | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchical, autarkical |
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| autarchical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarkical |
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| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autochthonic | (adjective) originating where it is found | Synonyms: autochthonal, autochthonous, endemic, indigenous |
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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 |
| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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| bacchantic | (adjective) of or relating to or resembling a bacchanalian reveler | - |
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| bacchic | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchanalian, carousing, orgiastic |
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| batrachian | (adjective) relating to frogs and toads | Synonyms: anuran, salientian |
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| beechen | (adjective) consisting of or made of wood of the beech tree | - |
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| beseeching | (adjective) begging | Synonyms: imploring, pleading |
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| bewitched | (adjective) captured, as if under a spell | Synonyms: ensorcelled |
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| bewitching | (adjective) capturing interest as if by a spell | Synonyms: captivating, enchanting, enthralling, entrancing, fascinating |
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| bichromated | (adjective) treated or combined with bichromate | - |
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| bichrome | (adjective) having two colors | Synonyms: bicolor, bicolored, bicolour, bicoloured, dichromatic |
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| biochemical | (adjective) of or relating to biochemistry; involving chemical processes in living organisms | - |
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| birch | (adjective) consisting of or made of wood of the birch tree | Synonyms: birchen, birken |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| bitchy | (adjective) marked by or arising from malice | Synonyms: cattish, catty |
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| blanched | (adjective) anemic looking from illness or emotion | Synonyms: ashen, bloodless, livid, white |
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| (adjective) (especially of plants) developed without chlorophyll by being deprived of light | Synonyms: etiolate, etiolated |
| bleached | (adjective) (used of color) artificially produced; not natural | Synonyms: colored, coloured, dyed |
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| (adjective) having lost freshness or brilliance of color | Synonyms: faded, washed-out, washy |
| blotched | (adjective) marked with irregularly shaped spots or blots | Synonyms: blotchy, splotched |
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| blotchy | (adjective) marred by discolored spots or blotches | - |
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| (adjective) marked with irregularly shaped spots or blots | Synonyms: blotched, splotched |
| botched | (adjective) spoiled through incompetence or clumsiness | Synonyms: bungled |
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| botchy | (adjective) poorly done | Synonyms: butcherly, unskillful |
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| brachial | (adjective) of or relating to an arm | - |
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| brachiate | (adjective) having arms or armlike appendages | - |
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| (adjective) having widely spreading paired branches | - |
| brachiopod | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopodous |
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