photoperiod

[ foh-tuh-peer-ee-uh d ]
/ ˌfoʊ təˈpɪər i əd /

noun Biology.

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

QUIZZES

ELEMENTARY SCHOOL PUNCTUATION QUIZ

Punctuation marks help make writing easy to read and understand. Some of the most important ones are the period (.), comma (,), question mark (?), and exclamation point (!). How well do you know how to use them? Find out in this quiz!
Question 1 of 10
Which punctuation mark is best for this sentence? "Can I watch a movie __"

Origin of photoperiod

First recorded in 1915–20; photo- + period

OTHER WORDS FROM photoperiod

pho·to·pe·ri·od·ic [foh-tuh-peer-ee-od-ik] /ˌfoʊ təˌpɪər iˈɒd ɪk/, pho·to·pe·ri·od·i·cal, adjectivepho·to·pe·ri·od·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for photoperiod

British Dictionary definitions for photoperiod

photoperiod
/ (ˌfəʊtəʊˈpɪərɪəd) /

noun

the period of daylight in every 24 hours, esp in relation to its effects on plants and animalsSee also photoperiodism

Derived forms of photoperiod

photoperiodic, adjectivephotoperiodically, adverb
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

Medical definitions for photoperiod

photoperiod
[ fō′tō-pîrē-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.

Other words from photoperiod

pho′to•pe′ri•odic (-ŏdĭk) null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for photoperiod

photoperiod
[ fō′tō-pîrē-əd ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.