photoperiod

noun
pho·​to·​pe·​ri·​od | \ˌfō-tō-ˈpir-ē-əd \

Definition of photoperiod 

: a recurring cycle of light and dark periods of constant length also : photophase sense 2

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Other Words from photoperiod

photoperiodic \ˌfō-​tō-​ˌpir-​ē-​ˈä-​dik \ adjective
photoperiodically \ˌfō-​tō-​ˌpir-​ē-​ˈä-​di-​k(ə-​)lē \ adverb

Examples of photoperiod in a Sentence

Recent Examples on the Web

About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018 About 10 varieties are being grown using photoperiod manipulation, which will be featured on the tours. Lauren Delgado, OrlandoSentinel.com, "5 questions about Florida Hops," 9 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'photoperiod.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of photoperiod

1920, in the meaning defined above

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Last Updated

21 Oct 2018

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Time Traveler for photoperiod

The first known use of photoperiod was in 1920

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More Definitions for photoperiod

photoperiod

noun
pho·​to·​pe·​ri·​od | \ˌfōt-ō-ˈpir-ē-əd \

Medical Definition of photoperiod 

: a recurring cycle of light and dark periods of constant length

Other Words from photoperiod

photoperiodic \-​ˌpir-​ē-​ˈäd-​ik \ adjective
photoperiodically \-​i-​k(ə-​)lē \ adverb

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