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photoperiodism

[foh-tuh-peer-ee-uh-diz-uh m] /ˌfoʊ təˈpɪər i əˌdɪz əm/
noun, Biology
1.
the response, as affecting growth or reproduction, of an organism to the length of exposure to light in a 24-hour period.
Also called photoperiodicity
[foh-toh-peer-ee-uh-dis-i-tee] /ˌfoʊ toʊˌpɪər i əˈdɪs ɪ ti/ (Show IPA)
.
Origin
1915-1920
1915-20; photoperiod + -ism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for photo periodicity

photoperiodism

/ˌfəʊtəʊˈpɪərɪəˌdɪzəm/
noun
1.
the response of plants and animals by behaviour, growth, etc, to photoperiods
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
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Word Origin and History for photo periodicity

photoperiodism

n.

1920, from photoperiod (1920, from photo- + period) + -ism.

Online Etymology Dictionary, © 2010 Douglas Harper
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photo periodicity in Medicine

photoperiodism pho·to·pe·ri·od·ism (fō'tō-pĭr'ē-ə-dĭz'əm) or pho·to·pe·ri·o·dic·i·ty (-pĭr'ē-ə-dĭs'ĭ-tē)
n.
The response of an organism to changes in its photoperiod, especially as indicated by vital processes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Word Value for photo

10
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