| 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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