photoperiodicity

photoperiodicity
pho·to·pe·ri·o·dic·i·ty (fo″to-pēr″e-o-disґĭ-te) photoperiodism.

Medical dictionary. 2011.

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  • photoperiodicity — pho·to·periodicity …   English syllables

  • photoperiodicity — noun see photoperiodism * * * photoperiodicˈity noun • • • Main Entry: ↑photo …   Useful english dictionary

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  • photoperiodism — /foh teuh pear ee euh diz euhm/, n. Biol. 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 pear ee euh dis i tee/. [1915 20;… …   Universalium

  • reproductive system, animal — Introduction       any of the organ systems by which animals reproduce.       The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… …   Universalium

  • photoperiodism — The periodic (seasonal or diurnal) activities, behavior, or changes in plants or animals brought about by the action of light. * * * pho·to·pe·ri·od·ism pir ē ə .diz əm also pho·to·pe·ri·od·ic·i·ty .pir ē ə dis ət ē n, pl isms also ties the… …   Medical dictionary

  • Thomas A Wehr — Thomas Alvin Wehr, MD, scientist emeritus at the National Institute of Mental Health is a psychiatrist, research scientist, author, and former chief of the Clinical Psychobiology branch at NIMH. Dr. Wehr conducted a study about photoperiodicity… …   Wikipedia

  • photoperiodism — [fōt΄ō pir′ēə dis′ə tēfōt΄ō pir′ē əd iz΄əm] n. Biol. the behavioral or physiological reaction of an organism to variations in the duration of light, as, in plants, by flowering or ceasing to flower, or, in certain animals, by changing the daily… …   English World dictionary

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