photoperiod
[ foh-tuh-peer-ee-uh d ]
/ ˌfoʊ təˈpɪər i əd /
|
noun Biology.
the interval in a 24-hour period during which a plant or animal is exposed to light.
Nearby words
photonuclear, photooxidation, photopathic, photopathy, photoperceptive, photoperiod, photoperiodism, photophilic, photophilous, photophobia, photophobic
Related formspho·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
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for photoperiod
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.
Broad limits to functional reproductive activity seem to be set by the photoperiod—neuroendocrine system.
The Breeding Birds of Kansas|Richard F. JohnstonIn general, Tb's showed a marked circadian cycle in phase with photoperiod.
British Dictionary definitions for photoperiod
photoperiod
/ (ˌfəʊtəʊˈpɪərɪəd) /
noun
the period of daylight in every 24 hours, esp in relation to its effects on plants and animalsSee also photoperiodism
Derived Formsphotoperiodic, adjectivephotoperiodically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Medicine definitions for photoperiod
photoperiod
[ fō′tō-pîr′ē-əd ]
n.
The duration of an organism's daily exposure to light, considered especially with regard to the effect of such exposure on growth and development.
Related formspho′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.
Science definitions for photoperiod
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.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.