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geotropism

[jee-o-truh-piz-uh m]
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noun Biology.
  1. oriented growth with respect to the force of gravity.
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Origin of geotropism

First recorded in 1870–75; geo- + -tropism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for geotropism

geotropism

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
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Derived Formsgeotropic (ˌdʒiːəʊˈtrɒpɪk), adjectivegeotropically, 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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

geotropism in Science

geotropism

[jē-ŏtrə-pĭz′əm]
  1. 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
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Related formsgeotropic adjective (jē′ə-trōpĭk, jē′ə-trŏpĭk)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.