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Miosis
noun (pl. mioses) 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). Synonyms: 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. Synonyms: light reflex, myosis, pupillary reflex.
WordNet 3.0 © 2010 Princeton University
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