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photoperiodism

Syllabification: (pho·to·pe·ri·od·ism)

(also photoperiodicity /-ˌpi(ə)rēəˈdisitē/)
Definition of photoperiodism

noun

Botany & Zoology
  • the response of an organism to seasonal changes in day length.

photoperiodism in other Oxford dictionaries

Definition of photoperiodism in the British & World English dictionary