Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Contraction of the pupil of the eye in response to an increase in light.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • 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

Etymologies

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Examples

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