geotropism

[ jee-o-truh-piz-uh m ]
/ dʒiˈɒ trəˌpɪz əm /
|

noun Biology.

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. 2019

Examples from the Web for geotropism

British Dictionary definitions for geotropism

geotropism

/ (dʒɪˈɒtrəˌpɪzəm) /

noun

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), 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

Science definitions for geotropism

geotropism

[ jē-ŏtrə-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

Related forms

geotropic adjective (jē′ə-trōpĭk, jē′ə-trŏpĭk)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.