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photoperiod

[ foh-tuh-peer-ee-uhd ]

noun

, Biology.
  1. the interval in a 24-hour period during which a plant or animal is exposed to light.


photoperiod

/ ˌfəʊtəʊˈpɪərɪəd /

noun

  1. the period of daylight in every 24 hours, esp in relation to its effects on plants and animals See also photoperiodism
“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-pîrē-əd /

  1. The duration of an organism's daily exposure to light, considered especially with regard to the phenomena of photoperiodism.


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Derived Forms

  • ˌphotoˌperiˈodically, adverb
  • ˌphotoˌperiˈodic, adjective
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Other Words From

  • pho·to·pe·ri·od·ic [foh-t, uh, -peer-ee-, od, -ik], photo·peri·odi·cal adjective
  • photo·peri·odi·cal·ly adverb
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Word History and Origins

Origin of photoperiod1

First recorded in 1915–20; photo- + period
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Example Sentences

Broad limits to functional reproductive activity seem to be set by the photoperiod—neuroendocrine system.

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.

In general, Tb's showed a marked circadian cycle in phase with photoperiod.

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photopathyphotoperiodism