photoperiod
American Heritage Dictionary:
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pho·to·pe·ri·od
(fō'tō-pîr'ē-əd) 
n.
The duration of an organism's daily exposure to light, considered especially with regard to the effect of the exposure on growth and development.
photoperiodic pho'to·pe'ri·od'ic (-ŏd'ĭk) or pho'to·pe'ri·od'i·cal (-ĭ-kəl) adj.
n.
The duration of an organism's daily exposure to light, considered especially with regard to the effect of the exposure on growth and development.
photoperiodic pho'to·pe'ri·od'ic (-ŏd'ĭk) or pho'to·pe'ri·od'i·cal (-ĭ-kəl) adj.
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photoperiod
American Heritage Stedman's Medical Dictionary:
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pho·to·pe·ri·od
(fō'tō-pĭr'ē-əd)
n.
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.Oxford Dictionary of Biochemistry:
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photoperiod
- the length of daylight in a 24-hour period.
- the duration of daily exposure of an organism to illumination; the length of this period that favours optimum functioning.
| photooxidize, photoorganotroph, photonicking | |
| photoperiodism, photophore, photophosphorylation |
Saunders Veterinary Dictionary:
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photoperiod
The period of time per day that an organism is exposed to daylight (or to artificial light).
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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Taylor's Dictionary for Gardeners
Taylor's Dictionary for Gardeners, by Frances Tenenbaum. Copyright © 1997 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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Oxford Dictionary of Biochemistry
Oxford University Press. Oxford Dictionary of Biochemistry and Molecular Biology © 1997, 2000, 2006 All rights reserved.
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