| apoapsis | (noun) (astronomy) the point in an orbit farthest from the body being orbited | Synonyms: point of apoapsis |
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| apocalypse | (noun) a cosmic cataclysm in which God destroys the ruling powers of evil | - |
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| apocalyptic | (adjective) of or relating to an apocalypse | - |
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| (adjective) prophetic of devastation or ultimate doom | Synonyms: apocalyptical, revelatory |
| apocalyptical | (adjective) prophetic of devastation or ultimate doom | Synonyms: apocalyptic, revelatory |
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| apocarpous | (adjective) (of ovaries of flowering plants) consisting of carpels that are free from one another as in buttercups or roses | - |
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| apochromatic | (adjective) corrected for both chromatic and spherical aberration | - |
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| apocope | (noun) abbreviation of a word by omitting the final sound or sounds | - |
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| apocrine | (adjective) (of exocrine glands) producing a secretion in which part of the secreting cell is released with the secretion | - |
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| apocryphal | (adjective) being of questionable authenticity | - |
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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| apocynaceous | (adjective) of or relating to tropical plants of the family Apocynaceae | - |
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| apodal | (adjective) (of snakes and eels) naturally footless | Synonyms: apodous |
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| apodeictic | (adjective) of a proposition; necessarily true or logically certain | Synonyms: apodictic |
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| apodeme | (noun) ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles | - |
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| apodictic | (adjective) of a proposition; necessarily true or logically certain | Synonyms: apodeictic |
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| apodous | (adjective) (of snakes and eels) naturally footless | Synonyms: apodal |
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| apoenzyme | (noun) a protein that combines with a coenzyme to form an active enzyme | - |
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| apogametic | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogamic, apogamous |
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| apogamic | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogametic, apogamous |
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| apogamous | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogametic, apogamic |
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| apogamy | (noun) (botany) development of an embryo without fertilization; especially the development in some ferns of a sporophyte from the gametophyte without fertilization | - |
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| apogean | (adjective) relating to or characteristic of an apogee | - |
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| apogee | (noun) apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth | - |
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| (noun) a final climactic stage | Synonyms: culmination |
| apojove | (noun) apoapsis in orbit around Jupiter | - |
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| apolemia | (noun) large siphonophore of up to 50 ft long | - |
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| apolitical | (adjective) politically neutral | Synonyms: unpolitical |
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| apoliticism | (noun) Apathy and/or antipathy towards all political affiliations. | - |
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| apologetic | (adjective) offering or expressing apology | Synonyms: excusatory |
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| apologetically | (adverb) in an apologetic manner | - |
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| apologetics | (noun) the branch of theology that is concerned with the defense of Christian doctrines | - |
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| apologia | (noun) a formal written defense of something you believe in strongly | Synonyms: apology |
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| apologise | (verb) acknowledge faults or shortcomings or failing | Synonyms: apologize |
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| (verb) defend, explain, clear away, or make excuses for by reasoning | Synonyms: apologize, excuse, rationalise, rationalize |
| apologist | (noun) a person who argues to defend or justify some policy or institution | Synonyms: justifier, vindicator |
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| apologize | (verb) acknowledge faults or shortcomings or failing | Synonyms: apologise |
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| (verb) defend, explain, clear away, or make excuses for by reasoning | Synonyms: apologise, excuse, rationalise, rationalize |
| apologue | (noun) a short moral story (often with animal characters) | Synonyms: allegory, fable, parable |
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| apology | (noun) a poor example | Synonyms: excuse |
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| (noun) an expression of regret at having caused trouble for someone | - |
| (noun) a formal written defense of something you believe in strongly | Synonyms: apologia |
| apolune | (noun) apoapsis in orbit around the moon | Synonyms: aposelene |
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| apomict | (noun) a plant that reproduces or is reproduced by apomixis | - |
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| apomictic | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictical |
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| (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamogenetic, agamous, parthenogenetic |
| apomictical | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictic |
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| apomixis | (noun) any of several kinds of reproduction without fertilization | - |
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| apomorphine | (noun) a morphine derivative that is not as strong as morphine; used as an emetic and in small doses as a sedative | - |
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| aponeurosis | (noun) any of the deeper and thicker fascia that attach muscles to bones; resemble flattened tendons | - |
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| aponeurotic | (adjective) of or relating to an aponeurosis | - |
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| apopemptic | (adjective) addressed to one who is departing | - |
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| apophasis | (noun) mentioning something by saying it will not be mentioned | - |
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| 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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