| apophatic | (adjective) of or relating to the belief that God can be known to humans only in terms of what He is not (such as `God is unknowable') | - |
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| apophatism | (noun) the religious belief that God cannot be known but is completely `other' and must be described in negative terms (in terms of what God is not) | - |
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| apophthegm | (noun) a short pithy instructive saying | Synonyms: aphorism, apothegm |
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| apophyseal | (adjective) of or relating to an apophysis | - |
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| apophysis | (noun) (anatomy) a natural outgrowth or projection on an organ or body part such as the process of a vertebra | - |
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| (noun) (botany) a natural swelling or enlargement: at the base of the stalk or seta in certain mosses or on the cone scale of certain conifers | - |
| apoplectic | (adjective) pertaining to or characteristic of apoplexy | - |
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| apoplectiform | (adjective) resembling apoplexy | Synonyms: apoplectoid |
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| apoplectoid | (adjective) resembling apoplexy | Synonyms: apoplectiform |
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| apoplexy | (noun) a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain | Synonyms: cerebrovascular accident, CVA, stroke |
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| apoptosis | (noun) a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival | Synonyms: caspase-mediated cell death, programmed cell death |
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| aposelene | (noun) apoapsis in orbit around the moon | Synonyms: apolune |
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| aposiopesis | (noun) breaking off in the middle of a sentence (as by writers of realistic conversations) | - |
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| aposiopetic | (adjective) relating to or characteristic of aposiopesis | - |
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| apostasy | (noun) the act of abandoning a party for cause | Synonyms: tergiversation |
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| (noun) the state of having rejected your religious beliefs for your political party or a cause (often in favor of opposing beliefs or causes) | Synonyms: defection, renunciation |
| apostate | (adjective) not faithful to religion or party or cause | - |
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| (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: deserter, ratter, recreant, renegade, turncoat |
| apostatise | (verb) abandon one's beliefs or allegiances | Synonyms: apostatize, tergiversate |
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| apostatize | (verb) abandon one's beliefs or allegiances | Synonyms: apostatise, tergiversate |
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| apostle | (noun) an ardent early supporter of a cause or reform | - |
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| apostleship | (noun) the position of apostle | - |
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| apostolic | (adjective) of or relating to or deriving from the Apostles or their teachings | Synonyms: apostolical |
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| (adjective) proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles | Synonyms: apostolical, papal, pontifical |
| apostolical | (adjective) of or relating to or deriving from the Apostles or their teachings | Synonyms: apostolic |
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| (adjective) proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles | Synonyms: apostolic, papal, pontifical |
| apostrophe | (noun) address to an absent or imaginary person | - |
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| (noun) the mark (') used to indicate the omission of one or more letters from a printed word | - |
| apostrophic | (adjective) of or characteristic of apostrophe | - |
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| apostrophise | (verb) use an apostrophe | Synonyms: apostrophize |
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| apostrophize | (verb) use an apostrophe | Synonyms: apostrophise |
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| apothecary | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: chemist, druggist, pharmacist, pill pusher, pill roller |
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| apothecial | (adjective) of or relating to the apothecium of some lichens and fungi | - |
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| apothecium | (noun) a cuplike ascocarp in many lichens and ascomycetous fungi | - |
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| apothegm | (noun) a short pithy instructive saying | Synonyms: aphorism, apophthegm |
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| apothegmatic | (adjective) given to or characterized by terse apothegms | Synonyms: apothegmatical |
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| (adjective) terse and witty and like a maxim | Synonyms: aphoristic, epigrammatic |
| apothegmatical | (adjective) given to or characterized by terse apothegms | Synonyms: apothegmatic |
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| apotheose | (verb) deify or glorify | Synonyms: apotheosise, apotheosize |
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| apotheosis | (noun) the elevation of a person (as to the status of a god) | Synonyms: deification, exaltation |
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| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: ideal, nonesuch, nonpareil, nonsuch, paragon, saint |
| apotheosise | (verb) deify or glorify | Synonyms: apotheose, apotheosize |
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| apotheosize | (verb) deify or glorify | Synonyms: apotheose, apotheosise |
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| apotropaic | (adjective) having the power to prevent evil or bad luck | - |
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| appoggiatura | (noun) an embellishing note usually written in smaller size | Synonyms: acciaccatura, grace note |
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| appoint | (verb) furnish | - |
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| (verb) assign a duty, responsibility or obligation to | Synonyms: charge |
| (verb) create and charge with a task or function | Synonyms: constitute, name, nominate |
| appointed | (adjective) subject to appointment | Synonyms: appointive |
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| (adjective) selected for a job | - |
| (adjective) provided with furnishing and accessories (especially of a tasteful kind) | - |
| (adjective) fixed or established especially by order or command | Synonyms: decreed, ordained, prescribed |
| appointee | (noun) an official who is appointed | - |
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| (noun) a person who is appointed to a job or position | Synonyms: appointment |
| appointive | (adjective) subject to appointment | Synonyms: appointed |
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| (adjective) relating to the act of appointing | - |
| appointment | (noun) the act of putting a person into a non-elective position | Synonyms: assignment, designation, naming |
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| (noun) the job to which you are (or hope to be) appointed | - |
| (noun) (law) the act of disposing of property by virtue of the power of appointment | - |
| (noun) (usually in the plural) furnishings and equipment (especially for a ship or hotel) | Synonyms: fitting |
| (noun) a meeting arranged in advance | Synonyms: date, engagement |
| (noun) a person who is appointed to a job or position | Synonyms: appointee |
| apportion | (verb) give out as one's portion or share | Synonyms: deal, divvy up, portion out, share |
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| (verb) distribute according to a plan or set apart for a special purpose | Synonyms: allocate |
| apportionable | (adjective) capable of being distributed | Synonyms: allocable, allocatable |
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| apportioned | (adjective) given out in portions | Synonyms: dealt out, doled out, meted out, parceled out |
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| apportioning | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportionment, assignation, parceling, parcelling |
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| apportionment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportioning, assignation, parceling, parcelling |
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| apposable | (adjective) capable of being placed opposite to something | Synonyms: opposable |
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| appose | (verb) place side by side or in close proximity | - |
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| apposite | (adjective) being of striking appropriateness and pertinence | Synonyms: apt, pertinent |
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| appositeness | (noun) appropriateness for the occasion | Synonyms: aptness |
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| apposition | (noun) the act of positioning close together (or side by side) | Synonyms: collocation, juxtaposition |
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| (noun) (biology) growth in the thickness of a cell wall by the deposit of successive layers of material | - |
| (noun) a grammatical relation between a word and a noun phrase that follows | - |
| appositional | (adjective) relating to or being in apposition | Synonyms: appositive |
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| appositive | (adjective) relating to or being in apposition | Synonyms: appositional |
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| appositively | (adverb) in an appositive manner | Synonyms: in apposition |
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| apropos | (adjective) of an appropriate or pertinent nature | - |
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| (adverb) at an opportune time | Synonyms: seasonably, timely, well-timed |
| (adverb) introducing a different topic | Synonyms: by the bye, by the way, incidentally |
| archespore | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archesporium |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archesporium | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archespore |
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| arthropod | (noun) invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin | - |
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| arthropodal | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodan, arthropodous |
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| arthropodan | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodous |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| arthrospore | (noun) one of a string of thick walled vegetative resting cells formed by some algae and fungi | - |
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| (noun) a body that resembles a spore but is not an endospore; produced by some bacteria | - |
| arthrosporic | (adjective) of or relating to arthrospores | Synonyms: arthrosporous |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ascospore | (noun) sexually produced fungal spore formed within an ascus | - |
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| ascosporic | (adjective) of or relating to ascospores | Synonyms: ascosporous |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| atopognosia | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosis |
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| atopognosis | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosia |
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| avoirdupois | (noun) excess bodily weight | Synonyms: blubber, fat, fatness |
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| (noun) a system of weights based on the 16-ounce pound (or 7,000 grains) | Synonyms: avoirdupois weight |
| balanoposthitis | (noun) inflammation of both the head of the penis and the foreskin | - |
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| ballpoint | (noun) a pen that has a small metal ball as the point of transfer of ink to paper | Synonyms: ballpen, ballpoint pen, Biro |
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| basidiospore | (noun) a sexually produced fungal spore borne on a basidium | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| bedpost | (noun) any of 4 vertical supports at the corners of a bedstead | - |
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| bespoke | (adjective) (of clothing) custom-made | Synonyms: bespoken, made-to-order, tailor-made, tailored |
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| bespoken | (adjective) pledged to be married | Synonyms: betrothed, engaged |
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| (adjective) (of clothing) custom-made | Synonyms: bespoke, made-to-order, tailor-made, tailored |
| bespot | (verb) mark with, or as if with, spots | - |
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| bibliopole | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopolist |
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| bibliopolic | (adjective) of or relating to bibliopoles | - |
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| bibliopolist | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopole |
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| bioweapon | (noun) any weapon usable in biological warfare | Synonyms: bioarm, biological weapon |
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| bipolar | (adjective) having two poles | - |
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| (adjective) of, pertaining to, or occurring in both polar regions | - |
| (adjective) of or relating to manic depressive illness | - |
| blackpoll | (noun) North American warbler having a black-and-white head | Synonyms: Dendroica striate |
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| bladderpod | (noun) any of several hairy North American herbs having yellow racemose flowers and inflated pods | - |
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| (noun) any of several plants of the genus Physaria having racemose yellow flowers and inflated pods | - |
| (noun) annual or perennial herbs with inflated seed pods; some placed in genus Lesquerella | - |
| (noun) North American wild lobelia having small blue flowers and inflated capsules formerly used as an antispasmodic | Synonyms: Indian tobacco, Lobelia inflata |
| blastoporal | (adjective) of or relating to a blastopore | Synonyms: blastoporic |
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| blastopore | (noun) the opening into the archenteron | - |
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| blastoporic | (adjective) of or relating to a blastopore | Synonyms: blastoporal |
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| bluepoint | (noun) small edible oyster typically from the southern shore of Long Island | Synonyms: blue point |
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| (noun) oysters originally from Long Island Sound but now from anywhere along the northeastern seacoast; usually eaten raw | Synonyms: blue point |
| boskopoid | (adjective) belonging or relating to or resembling Boskop man | - |
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| brachiopod | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopodous |
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| (noun) marine animal with bivalve shell having a pair of arms bearing tentacles for capturing food; found worldwide | Synonyms: lamp shell, lampshell |
| brachiopodous | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopod |
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| brainpower | (noun) mental ability | Synonyms: brain, learning ability, mental capacity, mentality, wit |
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| branchiopod | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopodan, branchiopodous |
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| (noun) aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding | Synonyms: branchiopod crustacean, branchiopodan |
| branchiopodan | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopod, branchiopodous |
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| (noun) aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding | Synonyms: branchiopod, branchiopod crustacean |
| branchiopodous | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopod, branchiopodan |
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| camelpox | (noun) a viral disease of camels closely related to smallpox | - |
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