photoperiod

photoperiod
the length of sunlit portion of the day, which changes seasonally and latitudinally. Also refers to the lighting regime set up for an aquarium or for an experiment

Dictionary of ichthyology. 2009.

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  • photoperiod — [fōt′ō pir΄ē əd] n. the number of daylight hours best suited to the growth and maturation of an organism photoperiodic [fōt΄ōpir΄ē äd′ik] adj …   English World dictionary

  • photoperiod — fotoperiodas statusas T sritis augalininkystė apibrėžtis Dienos šviesos meto ilgis, reikalingas augalui rutuliotis. atitikmenys: angl. photoperiod rus. фотопериод ryšiai: sinonimas – švieslaikis …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • photoperiod — noun Date: 1920 a recurring cycle of light and dark periods of constant length; also photophase 2 • photoperiodic adjective • photoperiodically adverb …   New Collegiate Dictionary

  • photoperiod — photoperiodic /foh teuh pear ee od ik/, photoperiodical, adj. photoperiodically, adv. /foh teuh pear ee euhd/, n. Biol. the interval in a 24 hour period during which a plant or animal is exposed to light. [1915 20; PHOTO + PERIOD] * * * …   Universalium

  • photoperiod — noun The normal duration of natural daylight experienced by an organism; daylength …   Wiktionary

  • photoperiod — pho·to·pe·ri·od .fōt ō pir ē əd n a recurring cycle of light and dark periods of constant length pho·to·pe·ri·od·ic .pir ē äd ik adj pho·to·pe·ri·od·i·cal·ly i k(ə )lē adv * * * pho·to·pe·ri·od (foґto pēr″e əd) the period of time… …   Medical dictionary

  • photoperiod — n. duration of exposure to light over a 24 hour period (Biology) fəʊtəʊpɪrɪəd / pəɪr …   English contemporary dictionary

  • photoperiod — noun Botany & Zoology the period of daily illumination received by an organism. Derivatives photoperiodic adjective …   English new terms dictionary

  • photoperiod —   Characteristic light interval that induces particular light mediated responses in plants.   Cf. thermoperiod …   Expanded glossary of Cycad terms

  • photoperiod — pho·to·period …   English syllables

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