photoperiodism

noun
pho·to·pe·ri·od·ism | \ˌfō-tō-ˈpir-ē-ə-ˌdi-zəm \

Definition of photoperiodism 

: a plant's or animal's response or capacity to respond to photoperiod

First Known Use of photoperiodism

circa 1911, in the meaning defined above

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The first known use of photoperiodism was circa 1911

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photoperiodism

noun
pho·to·pe·ri·od·ism | \-ˈpir-ē-ə-ˌdiz-əm \
variants: also photoperiodicity \-ˌpir-ē-ə-ˈdis-ət-ē \
plural photoperiodisms also -ties

Medical Definition of photoperiodism 

: the response or the capacity to respond to photoperiod

More from Merriam-Webster on photoperiodism

Britannica.com: Encyclopedia article about photoperiodism

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