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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)
   - 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
   - light reflex, pupillary reflex, myosis

Derived forms: mioses

Type of: cell division, cellular division, inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex

Encyclopedia: Miosis