gravitropismn.
/ˌɡravᵻˈtrəʊpɪz(ə)m/, U.S. /ˌɡrævəˈtrɑˌpɪzəm/ Botany.
Downward or upward growth of the parts of plants in response to the force of gravity; geotropism.Gravitropism is distinguished as positive or negative according to whether growth is respectively downward or upward. Cf. positive adj. 7, negative adj. 9b.
ΘΚΠ
the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > tropisms
heliotropism1854
geotropism1873
apheliotropism1880
apogeotropism1880
nyctitropism1880
paraheliotropism1881
hydrotropism1882
selenotropism1883
selenotropy1883
rheotropism1884
orthotropism1885
plagiotropism1886
geotropy1888
haptotropism1888
aerotropism1889
phototropy1892
autotropism1897
plagiotropy1898
thermotropism1898
traumatropism1898
phototropism1899
gravitropism1969
1969 L. J. Audus in M. B. Wilkins Physiol. Plant Growth & Devel. vi. 205 [Geotropism]..was an unfortunate choice, since it implied that only the earth's field would bring about a response. A better description would have been gravitropism.
1985 Cambr. Encycl. Life Sci. ii. 60/2 Cell expansion can be influenced to turn the axis back to the vertical (gravitropism, sensitivity to gravity) or parallel to the light (phototropism).
2009 W. G. Hopkins & N. P. A. Hüner Introd. Plant Physiol. (ed. 4) xxiii. 399/1 The shoot, which grows away from the center of the earth, exhibits negative gravitropism.
This is a new entry (OED Third Edition, June 2020; most recently modified version published online March 2022).
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n.1969