Pronunciation: (fō"tu-pēr'ē-u-diz"um), [key]
the response, as affecting growth or reproduction, of an organism to the length of exposure to light in a 24-hour period. Also called pho•to•pe•ri•o•dic•i•ty Pronunciation: (fō"tō-pēr"ē-u-dis'i-tē). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.