geotropism

geotropism

[jee-o-truh-piz-uhm]
noun Biology.
oriented growth with respect to the force of gravity.

Origin:
1870–75; geo- + -tropism

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Collins
World English Dictionary
geotropism (dʒɪˈɒtrəˌpɪzəm)
 
n
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
 
geotropic
 
adj
 
geo'tropically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
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