| abaxial | (adjective) facing away from the axis of an organ or organism | Synonyms: dorsal |
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| abbatial | (adjective) of or having to do with or belonging to an abbey or abbot, or abbess | - |
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| abranchial | (adjective) having no gills | Synonyms: abranchiate, abranchious, gill-less |
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| acapnial | (adjective) relating to or demonstrating acapnia | Synonyms: acapnic, acapnotic |
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| accessorial | (adjective) nonessential but helpful | - |
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| accusatorial | (adjective) specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor | - |
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| achenial | (adjective) pertaining to dry one-seeded indehiscent fruit | - |
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| actuarial | (adjective) of or relating to the work of an actuary | - |
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| adaxial | (adjective) nearest to or facing toward the axis of an organ or organism | Synonyms: ventral |
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| adventitial | (adjective) of or pertaining to the adventitia | - |
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| adverbial | (adjective) of or relating to or functioning as an adverb | - |
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| aecial | (adjective) of or belonging to an aecium | - |
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| aerial | (adjective) existing or living or growing or operating in the air | - |
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| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aeriform, aery, airy, ethereal |
| affixial | (adjective) of or pertaining to a linguistic affix | Synonyms: affixal |
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| agential | (adjective) of or relating to an agent or agency | - |
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| alluvial | (adjective) of or relating to alluvium | - |
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| altricial | (adjective) (of hatchlings) naked and blind and dependent on parents for food | - |
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| ambassadorial | (adjective) of or relating to or characteristic of ambassadors | - |
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| ambrosial | (adjective) worthy of the gods | Synonyms: ambrosian |
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| (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosian, nectarous |
| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antenuptial | (adjective) relating to events before a marriage | Synonyms: premarital, prenuptial |
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| antheridial | (adjective) relating to or characterized by an antheridium | - |
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| antibacterial | (adjective) destroying bacteria or inhibiting their growth | - |
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| antimicrobial | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobic |
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| antimonial | (adjective) containing antimony | - |
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| antisocial | (adjective) shunning contact with others | - |
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| (adjective) hostile to or disruptive of normal standards of social behavior | Synonyms: asocial |
| apothecial | (adjective) of or relating to the apothecium of some lichens and fungi | - |
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| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| armorial | (adjective) of or relating to heraldry or heraldic arms | - |
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| arterial | (adjective) of or involving or contained in the arteries | - |
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| artificial | (adjective) contrived by art rather than nature | Synonyms: unreal |
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| (adjective) artificially formal | Synonyms: contrived, hokey, stilted |
| (adjective) not arising from natural growth or characterized by vital processes | - |
| asocial | (adjective) given to avoiding association with others | - |
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| (adjective) hostile to or disruptive of normal standards of social behavior | Synonyms: antisocial |
| atrial | (adjective) of or relating to a cavity or chamber in the body (especially one of the upper chambers of the heart) | - |
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| auctorial | (adjective) of or by or typical of an author | Synonyms: authorial |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| axial | (adjective) of or relating to or resembling an axis of rotation | - |
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| (adjective) relating to or attached to the axis | Synonyms: axile |
| (adjective) situated on or along or in the direction of an axis | - |
| bacterial | (adjective) relating to or caused by bacteria | - |
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| baronial | (adjective) impressive in size, manner, or appearance | Synonyms: imposing, noble, stately |
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| basidial | (adjective) relating to or characterized by basidia | - |
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| beneficial | (adjective) promoting or enhancing well-being | Synonyms: good |
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| bestial | (adjective) resembling a beast; showing lack of human sensibility | Synonyms: beastly, brutal, brute, brutish |
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| biaxial | (adjective) having two axes | Synonyms: biaxal, biaxate |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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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 |
| bifacial | (adjective) having two faces or fronts | Synonyms: biface |
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| bilabial | (adjective) of or relating to or being a speech sound that is articulated using both lips | - |
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| bimestrial | (adjective) two months long; lasting two months | - |
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| (adjective) occurring every two months | Synonyms: bimonthly |
| bimillenial | (adjective) of or relating to a bimillennium | - |
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| binomial | (adjective) of or relating to or consisting of two terms | - |
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| (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binominal |
| biracial | (adjective) consisting of or combining two races | - |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| brachial | (adjective) of or relating to an arm | - |
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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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| branchial | (adjective) of or relating to gills (or to parts of the body derived from embryonic gills) | - |
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| bronchial | (adjective) relating to or associated with the bronchi | - |
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| cambial | (adjective) of or relating to or functioning as a cambium | - |
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| carnassial | (adjective) (of a tooth) adapted for shearing flesh | - |
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| catamenial | (adjective) of or relating to menstruation or the menses | Synonyms: menstrual |
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| categorial | (adjective) of or relating to the concept of categories | - |
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| celestial | (adjective) relating to or inhabiting a divine heaven | Synonyms: heavenly |
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| (adjective) of or relating to the sky | Synonyms: heavenly |
| (adjective) of heaven or the spirit | Synonyms: ethereal, supernal |
| censorial | (adjective) belonging or relating to a censor or a censor's functions | - |
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| centennial | (adjective) of or relating to or completing a period of 100 years | Synonyms: centenary |
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| cercarial | (adjective) of or relating to cercaria | - |
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| ceremonial | (adjective) marked by pomp or ceremony or formality | - |
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| chlamydial | (adjective) of or pertaining to the sexually transmitted infection or to the parasite | - |
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| cilial | (adjective) of or relating to cilia projecting from the surface of a cell | Synonyms: ciliary, ciliate |
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| circumferential | (adjective) lying around or just outside the edges or outskirts | - |
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| circumstantial | (adjective) fully detailed and specific about particulars | - |
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| clamatorial | (adjective) of or relating to Clamatores | - |
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| coaxial | (adjective) having a common axis | Synonyms: coaxal |
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| collegial | (adjective) characterized by or having authority vested equally among colleagues | - |
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| (adjective) of or resembling or typical of a college or college students | Synonyms: collegiate |
| colloquial | (adjective) characteristic of informal spoken language or conversation | Synonyms: conversational |
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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 |
| combinatorial | (adjective) relating to the combination and arrangement of elements in sets | - |
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| (adjective) relating to or involving combinations | Synonyms: combinative, combinatory |
| commercial | (adjective) connected with or engaged in or sponsored by or used in commerce or commercial enterprises | - |
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| (adjective) of or relating to commercialism | - |
| (adjective) of the kind or quality used in commerce; average or inferior | Synonyms: commercial-grade |
| (adjective) profit oriented | Synonyms: mercantile, mercenary, moneymaking |
| confidential | (adjective) the level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified | - |
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| (adjective) denoting confidence or intimacy | - |
| (adjective) entrusted with private information and the confidence of another | - |
| (adjective) (of information) given in confidence or in secret | Synonyms: secret |
| congenial | (adjective) suitable to your needs | - |
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| (adjective) (used of plants) capable of cross-fertilization or of being grafted | - |
| connubial | (adjective) of or relating to marriage or to the relationship between a wife and husband | Synonyms: conjugal |
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| consequential | (adjective) having important issues or results | Synonyms: eventful |
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| conspiratorial | (adjective) relating to or characteristic of conspiracy or conspirators | Synonyms: conspirative |
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| consubstantial | (adjective) regarded as the same in substance or essence (as of the three persons of the Trinity) | - |
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| controversial | (adjective) marked by or capable of arousing controversy | - |
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| convivial | (adjective) occupied with or fond of the pleasures of good company | Synonyms: good-time |
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| cordial | (adjective) diffusing warmth and friendliness | Synonyms: affable, amiable, genial |
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| (adjective) politely warm and friendly | - |
| (adjective) sincerely or intensely felt | - |
| coreferential | (adjective) relating to coreference | Synonyms: co-referent |
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| cranial | (adjective) of or relating to the cranium which encloses the brain | - |
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| criterial | (adjective) serving as a basis for evaluation | Synonyms: criterional |
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| crucial | (adjective) of extreme importance; vital to the resolution of a crisis | Synonyms: important |
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| (adjective) of the greatest importance | Synonyms: all-important, all important, essential, of the essence |
| (adjective) having crucial relevance | - |
| curatorial | (adjective) of or relating to a curator or the duties of a curator | - |
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| cursorial | (adjective) (of limbs and feet) adapted for running | - |
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| custodial | (adjective) providing protective supervision; watching over or safeguarding | Synonyms: tutelar, tutelary |
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| cyanobacterial | (adjective) relating to or caused by photosynthetic bacteria of the class Cyanobacteria | Synonyms: cyanophyte |
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| deferential | (adjective) showing deference | Synonyms: deferent, regardful |
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| diaphysial | (adjective) relating to the diaphysis of a bone | Synonyms: diaphyseal |
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| dictatorial | (adjective) of or characteristic of a dictator | - |
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| (adjective) expecting unquestioning obedience | Synonyms: authoritarian, overbearing |
| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: authoritarian, autocratic, despotic, tyrannic, tyrannical |
| differential | (adjective) relating to or showing a difference | - |
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| (adjective) involving or containing one or more derivatives | - |
| diluvial | (adjective) of or connected with a deluge | Synonyms: diluvian |
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| doctorial | (adjective) of or relating to a doctor or doctorate | Synonyms: doctoral |
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