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Dictionary

dark' adapta"tion

Ophthalm.
the reflex adaptation of the eye to dim light, consisting of a dilatation of the pupil and an increase in the number of functioning rods accompanied by a decrease in the number of functioning cones (opposed to light adaptation).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

dark

Dark Ages

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