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.
Phototonic — 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,… … The Collaborative International Dictionary of English
phototonic — See phototonus. * * * … Universalium
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 — /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} …
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
