ˌfōd.(ˌ)ōˈpirēəˌdizəm noun
also pho·to·periodicity ˌfōd.(ˌ)ō+
( plural photoperiodisms also photoperiodicities )
Etymology: photoperiodism International Scientific Vocabulary phot- + period + -ism; photoperiodicity from photoperiodic (from phot- + periodic) + -ity
: capacity to respond to the photoperiod