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Dictionary


pho•to•pe•ri•od



Pronunciation: (fō"tu-pēr'ē-ud), [key]
n. Biol.
the interval in a 24-hour period during which a plant or animal is exposed to light.

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

photopathyphotoperiodism

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