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geotropism

[jee-o-truh-piz-uh m] /dʒiˈɒ trəˌpɪz əm/
noun, Biology
1.
oriented growth with respect to the force of gravity.
Origin
1870-1875
1870-75; geo- + -tropism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for geotropism

geotropism

/dʒɪˈɒtrəˌpɪzəm/
noun
1.
the response of a plant part to the stimulus of gravity. Plant stems, which grow upwards irrespective of the position in which they are placed, show negative geotropism
Derived Forms
geotropic (ˌdʒiːəʊˈtrɒpɪk) adjective
geotropically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for geotropism
n.

1874, from German Geotropismus, from geo- + Greek trope (see trope). Coined in 1868 by German botanist Albert Bernhard Frank (1839-1900). Related: Geotropic.

Online Etymology Dictionary, © 2010 Douglas Harper
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geotropism in Science
geotropism
  (jē-ŏt'rə-pĭz'əm)   
The directional growth of an organism in response to gravity. Roots display positive geotropism when they grow downwards, while shoots display negative geotropism when they grow upwards. Also called gravitropism.

geotropic adjective (jē'ə-trō'pĭk, jē'ə-trŏp'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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