| 单词 | annihilation |
| 释义 | annihilation /euh nuy'euh lay"sheuhn/, n. 1. the act or an instance of annihilating. 2. the state of being annihilated; extinction; destruction. 3. Physics. a. Also called pair annihilation. the process in which a particle and antiparticle unite, annihilate each other, and produce one or more photons. Cf. positronium. b. the conversion of rest mass into energy in the form of electromagnetic radiation. [1630-40; ( < F) < LL annihilation- (s. of annihilatio). See ANNIHILATE, -ION] |
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