| miosis | (noun) reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller | Synonyms: light reflex, myosis, pupillary reflex |
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| (noun) (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) | Synonyms: meiosis, reduction division |
| miotic | (adjective) of or relating to or causing constriction of the pupil of the eye | Synonyms: myotic |
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| (noun) a drug that causes miosis (constriction of the pupil of the eye) | Synonyms: miotic drug, myotic, myotic drug |