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1. Oxford American Dictionary

   photoperiod

   • IPA[ˈfōdōˌpirēəd]

   美式

   • n.
     the period of time each day during which an organism receives illumination; day length.

   • noun: photoperiod, plural noun: photoperiods

2. • 更多解釋

   photoperiod

   • IPA[ˈfəʊtəʊˌpɪərɪəd]

   英式

   • n.
     the period of time each day during which an organism receives illumination; day length.

   Oxford Dictionary