Etymology
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miosis (n.)

"contraction of the pupil of the eye," 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.

updated on January 27, 2019

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Definitions of miosis from WordNet

miosis (n.)
(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
miosis (n.)
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 / pupillary reflex / myosis
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.