(redirected from phototonic)
Also found in: Medical.


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.


(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 ?
Russell, "Supercontinuum generation by stimulated Raman scattering and parametric four-wave mixing in phototonic crystal fibers," J.
Formerly with Phototonic, Steve has more than 20 years of experience in sales, including 15 in engineering.
Formerly with Phototonic, he has been in sales over 20 years, 15 in the engineering area.