from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The physical and chemical adjustments of the eye, including dilation of the pupil and increased activity of rods in the retina, that make vision possible in relative darkness.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the process of adjusting the eyes to low levels of illumination; cones adapt first; rods continue to adapt for up to four hours
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