phytochrome

noun
phy·​to·​chrome | \ˈfī-tə-ˌkrōm \

Definition of phytochrome 

: any of a group of proteins bound to light-absorbing pigments in many plants that play a role in initiating floral and developmental processes when activated by red or near-infrared radiation

First Known Use of phytochrome

1960, in the meaning defined above

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The first known use of phytochrome was in 1960

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