Constriction of pupils

• The nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants)
• Constriction of the eye's pupil
• Excessive pupil constriction
• Reproductive cell division
• Excessive contraction of the pupil

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

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 ...

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 .

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 ...