noun Date: 1920 a recurring cycle of light and dark periods of constant length; also photophase 2 • photoperiodic adjectivephotoperiodically adverb

New Collegiate Dictionary. 2001.

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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 — 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

  • 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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