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phototropism definition

pho·tot·ro·pism (fō tä′trə piz′əm)

noun

any positive, or negative, movement of a part of a plant toward, or away from, light sources
see heliotropism

Etymology: photo- + tropism

Related Forms:

  • phototropic pho′to·trop′ic (fōt′ō träp′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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