phototonus


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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
2), and phototonus or "sensitiveness to light in plants" (def.