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What is "miosis"

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miosis
Douglas Harper's Etymology Dictionary
miosis

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.

Wiktionary
miosis

n. Contraction of the pupil of the eye.

WordNet
miosis

  1. 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) [syn: meiosis, reduction division]

  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 [syn: light reflex, pupillary reflex, myosis]

  3. [also: mioses (pl)]

Wikipedia
Miosis

Miosis or myosis, /maɪˈoʊ sɪs/, from Ancient Greek μύειν, mūein, "to close the eyes", is a term with various definitions, which generally include constriction of the pupil.

The opposite condition, mydriasis, is the dilation of the pupil. Anisocoria is the condition of one pupil being more dilated than the other.