photoperiodism Syllabification: (pho·to·pe·ri·od·ism)Pronunciation: /ˌfōtōˈpi(ə)rēəˌdizəm/ (also photoperiodicity /-ˌpi(ə)rēəˈdisitē/)Definition of photoperiodism noun Botany & Zoology the response of an organism to seasonal changes in day length. photoperiodism in other Oxford dictionaries Definition of photoperiodism in the British & World English dictionary
