phototonus

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phototonus

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

pho′to·ton′ic (fō′tə-tŏn′ĭk) adj.
References in periodicals archive ?
Her describes where glass technology is going, he sees a bright future in fuel cells, and he is clearly excited by smart materials and the imminent phototonic revolution.