photophase

noun
pho·​to·​phase | \ ˈfō-tə-ˌfāz How to pronounce photophase (audio) \

Definition of photophase

2 : the light period of a photoperiodic cycle of light and dark

First Known Use of photophase

1944, in the meaning defined at sense 1

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The first known use of photophase was in 1944

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