[ foh-tuh-peer-ee-uhd ]
/ ˌfoʊ təˈpɪər i əd /
the interval in a 24-hour period during which a plant or animal is exposed to light.
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Origin of photoperiod
First recorded in 1915–20; photo-
OTHER WORDS FROM photoperiodpho·to·pe·ri·od·ic [foh-tuh-peer-ee-od-ik], /ˌfoʊ təˌpɪər iˈɒd ɪk/, pho·to·pe·ri·od·i·cal, adjectivepho·to·pe·ri·od·i·cal·ly, adverb
Words nearby photoperiod
, photo-patch test
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for photoperiod
the period of daylight in every 24 hours, esp in relation to its effects on plants and animalsSee also photoperiodism
Derived forms of photoperiodphotoperiodic, adjectivephotoperiodically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
The duration of an organism's daily exposure to light, considered especially with regard to the effect of such exposure on growth and development.
Other words from photoperiodpho′to•pe′ri•od′ic (-ŏd′ĭk) null adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
The duration of an organism's daily exposure to light, considered especially with regard to the phenomena of photoperiodism.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.