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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.

Origin of geotropism

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

Examples from the Web for geotropism

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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
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.

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
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.

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