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Definition of phototropism - 4 dictionary results

pho⋅tot⋅ro⋅pism

  [foh-to-truh-piz-uhm, foh-toh-troh-piz-uhm]
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–noun Botany.
phototropic tendency or growth.
Origin:
1895–1900; photo- + -tropism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pho·tot·ro·pism   (fō-tŏt'rə-pĭz'əm, fō'tō-trō'pĭz'əm)   
n.  Growth or movement of a sessile organism toward or away from a source of light.
pho'to·tro'pic (fō'tə-trō'pĭk, -trŏp'ĭk) adj., pho'to·tro'pi·cal·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: pho·tot·ro·pism
Pronunciation: fO-'tä-tr&-"piz-&m, "fOt-O-'trO-"piz-&m
Function: noun
: a tropism in whichlight is the orienting stimulus —see HELIOTROPISM
2 : the reversible change in color of asubstance produced by the formation of an isomeric modification when exposed to radiant energy (as light)
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

phototropism pho·tot·ro·pism (fō-tŏt'rə-pĭz'əm)
n.
Growth or movement of a sessile organism toward or away from a source of light.

pho'to·tro'pic (fō'tə-trō'pĭk, -trŏp'ĭk) adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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