photoperiod Hear it!

photoperiod definition

photo·peri·od (fōt′ō pir′ē əd)

noun

the number of daylight hours best suited to the growth and maturation of an organism

Related Forms:

  • photoperiodic pho′to·pe′ri·od′ic (-pir′ē äd′ik) adjective

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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