phototonus


Also found in: Medical.

pho·tot·o·nus

 (fō-tŏt′n-əs)
n.
The state of being sensitive to or irritated by light.

pho′to·ton′ic (fō′tə-tŏn′ĭk) adj.

phototonus

(fəʊˈtɒtənəs)
n
(Botany) the condition of plants that enables them to respond to the stimulus of light
[C19: from photo- + Greek tonos tone]
phototonic adj
References in periodicals archive ?
2), and phototonus or "sensitiveness to light in plants" (def.