Definitions for: 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
[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: light reflex, meiosis, myosis, pupillary reflex, reduction division

See Also: anaphase, cell division, cellular division, inborn reflex, innate reflex, instinctive reflex, karyokinesis, metaphase, nondisjunction, physiological reaction, prophase, reflex, segregation, telophase, unconditioned reflex

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