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photoperiod (duration of daylight) noun | fotoperiodonoun |
photoperiodism (biology: growth, development and other responses of plants and animals according to length of day and/or night) noun [UK: fˌəʊtəʊpˈiərɪədˌɪzəm] [US: fˌoʊɾoʊpˈiərɪədˌɪzəm] | fotoperiodismonoun |