pho·tot·o·nus (f -t t n- s)n. The state of being sensitive to or irritated by light. pho  to·tonic (ft-tn k) adj. |
phototonus [fəʊˈtɒtənəs]
n
(Life Sciences & Allied Applications / Botany) the condition of plants that enables them to respond to the stimulus of light
[from photo- + Greek tonos tone]
phototonic [ˌfəʊtəʊˈtɒnɪk] adj
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