phototonus Hear it!

phototonus definition

pho·tot·o·nus (fō tät′ə nəs)

noun

Biol. the state of being responsive to or irritated by exposure to light

Etymology: ModL: see photo- & tone

Related Forms:

  • phototonic pho′to·ton′ic (fōt′ō tän′ik) adjective

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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