photoperiod

photoperiod definition - medical

pho·to·pe·ri·od (fōˌtō-pîrˈē-əd)

noun
The duration of an organism's daily exposure to light, considered especially with regard to the effect of such exposure on growth and development.

Related Forms:

  • phoˌto·peˌri·odˈic (-ŏdˈĭk), phoˌto·peˌri·odˈi·cal (-ĭ-kəl) adjective

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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