[jee-oh-trop-ik, -troh-pik]
adjective Biology.
of, pertaining to, or exhibiting geotropism.

1870–75; geo- + -tropic

geotropically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
geotropism (dʒɪˈɒtrəˌpɪzəm)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
geotropism   (jē-ŏt'rə-pĭz'əm)  Pronunciation Key 
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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Example sentences
Living things that are sensitive to gravity are said to be geotropic.
Selection for geotropic root elongation rate in alfalfa under field conditions.
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