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

First Known Use of PHOTOPERIOD

1920

pho·to·pe·ri·od

noun \ˌfōt-ō-ˈpir-ē-əd\   (Medical Dictionary)

Medical Definition of PHOTOPERIOD

: a recurring cycle of light and dark periods of constant length
pho·to·pe·ri·od·ic \-ˌpir-ē-ˈäd-ik\ adjective
pho·to·pe·ri·od·i·cal·ly \-i-k(ə-)lē\ adverb

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