photoperiod definition | Dictionary.com

pho⋅to⋅pe⋅ri⋅od

[foh-tuh-peer-ee-uh

Use photoperiod in a Sentence

–noun Biology.

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

Origin:
1915–20; photo- + period

Related forms:

pho⋅to⋅pe⋅ri⋅od⋅ic [foh-tuh-peer-ee-od-ik]

, pho⋅to⋅pe⋅ri⋅od⋅i⋅cal, adjective

pho⋅to⋅pe⋅ri⋅od⋅i⋅cal⋅ly, adverb

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To photoperiod

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.
pho'to·pe'ri·od'ic (-ŏd'ĭk), pho'to·pe'ri·od'i·cal (-ĭ-kəl) adj.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Main Entry: pho·to·pe·ri·od
Pronunciation: "fOt-O-'pir-E-&d
Function: noun
: a recurring cycle of light and dark periods ofconstant length —pho·to·pe·ri·od·ic /-"pir-E-'äd-ik/ adjective —pho·to·pe·ri·od·i·cal·ly /-i-k(&-)lE/ adverb

Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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.

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.

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