photoperiod
pho·to·pe·ri·od
noun \-ˈpir-ē-əd\Definition of PHOTOPERIOD
: a recurring cycle of light and dark periods of constant length; also : photophase 2
— pho·to·pe·ri·od·ic \-ˌpir-ē-ˈä-dik\ adjective
— pho·to·pe·ri·od·i·cal·ly \-di-k(ə-)lē\ adverb
See First Known Use of PHOTOPERIOD
1920
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