photoperiod
[foh-tuh-peer-ee-uh d]
- the interval in a 24-hour period during which a plant or animal is exposed to light.
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Origin of photoperiod
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for photoperiod
Historical Examples
In general, Tb's showed a marked circadian cycle in phase with photoperiod.
Broad limits to functional reproductive activity seem to be set by the photoperiod—neuroendocrine system.
The Breeding Birds of KansasRichard F. Johnston
These captives had been kept for several months at a temperature of 21 degrees Centigrade, and on a daily photoperiod of 15 hours.
The mice were kept in a room in which temperature and photoperiod were controlled.
photoperiod
- the period of daylight in every 24 hours, esp in relation to its effects on plants and animalsSee also photoperiodism
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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
photoperiod
(fō′tō-pîr′ē-əd)- The duration of an organism's daily exposure to light, considered especially with regard to the effect of such exposure on growth and development.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
photoperiod
[fō′tō-pîr′ē-əd]
- The duration of an organism's daily exposure to light, considered especially with regard to the phenomena of photoperiodism.
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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.