MIOSIS

• (noun) 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

• (noun) (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

WordNet® 3.0, © 2006 by Princeton University.

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