gravitropismn.

Brit.

/ˌɡravᵻˈtrəʊpɪz(ə)m/, U.S.

/ˌɡrævəˈtrɑˌpɪzəm/

Origin: Formed within English, by compounding. Etymons: gravity n., -tropism comb. form.

Etymology: < gravi- (in gravity n.) + -tropism comb. form, after gravitropic adj. Compare earlier geotropism n.

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).

单词	gravitropism
释义	gravitropismn. Brit. /ˌɡravᵻˈtrəʊpɪz(ə)m/, U.S. /ˌɡrævəˈtrɑˌpɪzəm/ Origin: Formed within English, by compounding. Etymons: gravity n., -tropism comb. form. Etymology: < gravi- (in gravity n.) + -tropism comb. form, after gravitropic adj. Compare earlier geotropism n. 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). < n.1969
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