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Meaning of photoperiodism

pho•to•pe•ri•od•ism

Pronunciation: (fō"tu-pēr'ē-u-diz"um), [key]
— n. Biol.
  1. the response, as affecting growth or reproduction, of an organism to the length of exposure to light in a 24-hour period. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.