Phototonus Pho*tot"o*nus, n. [NL. See {Photo-}, and {Tone}.] 1. (Bot.) A motile condition in plants resulting from exposure to light. -- {Pho`to*ton"ic}, a. [1913 Webster]

2. (Physiol.) An irritable condition of protoplasm, resulting in movement, due to a certain intensity of light. -- {Pho`to*ton"ic}, a. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Phototōnus — (griech.), der durch das Licht bedingte bewegungsfähige Zustand reizbarer und periodisch beweglicher Pflanzenteile; s. Pflanzenbewegungen …   Meyers Großes Konversations-Lexikon

  • phototonus — [fō tät′ə nəs] n. [ModL: see PHOTO & TONE] Biol. the state of being responsive to or irritated by exposure to light phototonic [fōt΄ō tän′ik] adj …   English World dictionary

  • phototonus — fōˈtätənəs noun Etymology: New Latin, from phot + tonus : tonic condition (as of musculature) resulting from exposure to particular conditions of lighting phototonus in plants usually results in curvature towards a source of light …   Useful english dictionary

  • phototonus — n. [Gr. phos, light; tonos, tension] 1. Sensitiveness to light. 2. Muscle tonus stimulated by light …   Dictionary of invertebrate zoology

  • phototonus — phototonic /foh teuh ton ik/, adj. /foh tot n euhs/, n. Biol. 1. the normal condition of sensitiveness to light in organisms or their organs. 2. the irritability exhibited by cytoplasm when exposed to light of a certain intensity. [1870 75; PHOTO …   Universalium

  • phototonus — noun sensitivity to, or irritation caused by light …   Wiktionary

  • phototonus — pho·tot·o·nus (fo totґə nəs) [photo + tonus] the sensitivity of an organism to light …   Medical dictionary

  • phototonus — n. sensitivity to light; response to light stimuli (Biology) …   English contemporary dictionary

  • phototonus — pho·tot·o·nus …   English syllables

  • phototonus — /foʊˈtɒtənəs/ (say foh totuhnuhs) noun 1. the normal condition of sensitiveness to light in leaves, etc. 2. the irritability exhibited by protoplasm when exposed to light of a certain intensity. {New Latin, from Greek phōto photo + tonos tension} …   Australian English dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”