单词	photoperiod
释义	photoperiod noun pho·​to·​pe·​ri·​od ˌfō-tō-ˈpir-ē-əd  : a recurring cycle of light and dark periods of constant length also : photophase sense 2 photoperiodic ˌfō-tō-ˌpir-ē-ˈä-dik  adjective photoperiodically ˌfō-tō-ˌpir-ē-ˈä-di-k(ə-)lē  adverb Example Sentences Recent Examples on the Web As mentioned earlier, brood fish are housed in the same indoor tanks where scientists fool them into spawning by playing around with photoperiods and water temperature. Matt Williams, Dallas News, 9 May 2020 The prompt to begin growing a fresh set of antlers is regulated by a rise in testosterone, which is triggered by photoperiod. Andrew Mckean, Outdoor Life, 26 Mar. 2020 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, 9 July 2018 See More Word History First Known Use 1920, in the meaning defined above Medical Definition photoperiod noun pho·​to·​pe·​ri·​od ˌfōt-ō-ˈpir-ē-əd  : a recurring cycle of light and dark periods of constant length
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