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WordNet (r) 3.0 (2006) (WordNet)

miosis
n 1: (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) [synonym:
{meiosis}, {miosis}, {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 [synonym: {light reflex}, {pupillary
reflex}, {miosis}, {myosis}]

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