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[foh-tot-n-uh s] /foʊˈtɒt n əs/

noun, Biology.
the normal condition of sensitiveness to light in organisms or their organs.
the irritability exhibited by cytoplasm when exposed to light of a certain intensity.
the condition of plants that enables them to respond to the stimulus of light

phototonus pho·tot·o·nus (fō-tŏt’n-əs)
The state of being sensitive to or irritated by light.
pho’to·ton’ic (fō’tə-tŏn’ĭk) adj.


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