(genetics) cell division that produces reproductive cells in sexually reproducing organisms

• Excessive contraction of the pupil
• Reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
• Constriction of the pupil
• Constriction of the eye's pupil
• The nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants)

WordNet Word definitions in WordNet
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 ...

Wikipedia Word definitions in Wikipedia
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 ...

Wiktionary Word definitions in Wiktionary
n. Contraction of the pupil of the eye.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
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 .