miosis
英 [maɪ'əʊsɪs]
- n. （生殖细胞的）成熟分裂；减数分裂；[医] 瞳孔缩小
英英释义
- 1. (genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants)
- 2. reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
英文词源
- miosis (n.)
- 1819, from Greek myein "to shut (the eyes)" + -osis. Greek myein is perhaps originally "to close the lips," from PIE *meue- "to be silent" (see mute (adj.)). Related: Miotic.