photoperiodic

photoperiod

[foh-tuh-peer-ee-uhd]
noun Biology.
the interval in a 24-hour period during which a plant or animal is exposed to light.

Origin:
1915–20; photo- + period

photoperiodic [foh-tuh-peer-ee-od-ik] , photoperiodical, adjective
photoperiodically, adverb
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World English Dictionary
photoperiod (ˌfəʊtəʊˈpɪərɪəd)
 
n
See also photoperiodism the period of daylight in every 24 hours, esp in relation to its effects on plants and animals
 
photoperi'odic
 
adj
 
photoperi'odically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

photoperiod pho·to·pe·ri·od (fō'tō-pĭr'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.


pho'to·pe'ri·od'ic (-ŏd'ĭk) or pho'to·pe'ri·od'i·cal (-ĭ-kəl) adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
photoperiod   (fō'tō-pîr'ē-əd)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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