| acapnial | (adjective) relating to or demonstrating acapnia | Synonyms: acapnic, acapnotic |
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| achenial | (adjective) pertaining to dry one-seeded indehiscent fruit | - |
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| aeonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: eonian |
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| (adjective) continuing forever or indefinitely | Synonyms: ageless, eonian, eternal, everlasting, perpetual, unceasing, unending |
| ammoniac | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniacal |
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| ammoniacal | (adjective) pertaining to or containing or similar to ammonia | Synonyms: ammoniac |
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| ammoniated | (adjective) combined or treated with ammonia | - |
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| antimonial | (adjective) containing antimony | - |
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| 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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| baronial | (adjective) impressive in size, manner, or appearance | Synonyms: imposing, noble, stately |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| bimillenial | (adjective) of or relating to a bimillennium | - |
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| brachycranial | (adjective) having a short broad head with a cephalic index of over 80 | Synonyms: brachycephalic, brachycranic |
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| calumniatory | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumnious, defamatory, denigrating, denigrative, denigratory, libellous, libelous, slanderous |
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| catamenial | (adjective) of or relating to menstruation or the menses | Synonyms: menstrual |
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| catarrhinian | (adjective) of or related to Old World monkeys that have nostrils together and opening downward | Synonyms: catarrhine |
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| centennial | (adjective) of or relating to or completing a period of 100 years | Synonyms: centenary |
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| ceremonial | (adjective) marked by pomp or ceremony or formality | - |
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| chelonian | (adjective) of or relating to or resembling or being a turtle or tortoise | - |
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| chthonian | (adjective) dwelling beneath the surface of the earth | Synonyms: chthonic, nether |
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| colonial | (adjective) of or relating to or characteristic of or inhabiting a colony | - |
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| (adjective) of animals who live in colonies, such as ants | - |
| (adjective) composed of many distinct individuals united to form a whole or colony | Synonyms: compound |
| congenial | (adjective) suitable to your needs | - |
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| (adjective) (used of plants) capable of cross-fertilization or of being grafted | - |
| cranial | (adjective) of or relating to the cranium which encloses the brain | - |
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| demoniac | (adjective) of, pertaining to, or like a demon or possession by a demon | Synonyms: demoniacal, possessed |
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| demoniacal | (adjective) of, pertaining to, or like a demon or possession by a demon | Synonyms: demoniac, possessed |
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| deniable | (adjective) capable of being denied or contradicted | - |
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| dolichocranial | (adjective) having a relatively long head with a cephalic index of under 75 | Synonyms: dolichocephalic, dolichocranic |
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| eonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: aeonian |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eternal, everlasting, perpetual, unceasing, unending |
| genial | (adjective) of or relating to the chin or median part of the lower jaw | Synonyms: mental |
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| (adjective) diffusing warmth and friendliness | Synonyms: affable, amiable, cordial |
| (adjective) agreeable, conducive to comfort | Synonyms: kind |
| hominian | (adjective) characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures | Synonyms: hominid |
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| insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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| intracranial | (adjective) within the skull | - |
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| laciniate | (adjective) having edges irregularly and finely slashed | Synonyms: fringed |
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| laniary | (adjective) of or relating to a pointed conical tooth | Synonyms: canine |
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| leptorrhinian | (adjective) having a long narrow nose | Synonyms: leptorhine, leptorrhine, leptorrhinic |
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| maniac | (adjective) wildly disordered | Synonyms: maniacal |
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| maniacal | (adjective) wildly disordered | Synonyms: maniac |
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| matrimonial | (adjective) of or relating to the state of marriage | Synonyms: marital, married |
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| megalomaniacal | (adjective) suffering from megalomania | Synonyms: megalomanic |
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| menial | (adjective) used of unskilled work (especially domestic work) | Synonyms: humble, lowly |
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| millennial | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennian |
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| millennian | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennial |
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| miniature | (adjective) being on a very small scale | - |
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| monomaniacal | (adjective) obsessed with a single subject or idea | - |
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| nymphomaniac | (adjective) (used of women) affected with excessive sexual desire | Synonyms: nymphomaniacal |
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| nymphomaniacal | (adjective) (used of women) affected with excessive sexual desire | Synonyms: nymphomaniac |
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| patrimonial | (adjective) inherited or inheritable by established rules (usually legal rules) of descent | Synonyms: ancestral, hereditary, transmissible |
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| pecuniary | (adjective) relating to or involving money | Synonyms: monetary |
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| penial | (adjective) of or relating to the penis | Synonyms: penile |
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| perennial | (adjective) lasting three seasons or more | - |
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| (adjective) recurring again and again | Synonyms: recurrent, repeated |
| (adjective) lasting an indefinitely long time; suggesting self-renewal | - |
| platyrhinian | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhine, platyrrhine, platyrrhinian, platyrrhinic |
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| platyrrhinian | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhine, platyrhinian, platyrrhine, platyrrhinic |
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| polemoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Polemoniaceae | - |
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| postmillennial | (adjective) of or relating to the period following the millennium | - |
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| quincentennial | (adjective) of or relating to a 500th anniversary | Synonyms: quincentenary |
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| semicentennial | (adjective) of or relating to or marking the 50th anniversary | Synonyms: semicentenary |
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| testimonial | (adjective) of or relating to or constituting testimony | - |
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| (adjective) expressing admiration or appreciation | - |
| tricentennial | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentenary |
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| triennial | (adjective) occurring every third year or lasting 3 years | - |
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| unceremonial | (adjective) without ceremony or formality | Synonyms: unceremonious |
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| uncongenial | (adjective) not suitable to your tastes or needs | Synonyms: incompatible |
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| (adjective) used of plant stock or scions; incapable of being grafted | - |
| (adjective) very unfavorable to life or growth | Synonyms: hostile, unfriendly |
| undeniable | (adjective) not possible to deny | - |
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| venial | (adjective) easily excused or forgiven | Synonyms: excusable, forgivable |
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| (adjective) warranting only temporal punishment | Synonyms: minor |
| vicennial | (adjective) occurring once every 20 years | - |
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