geotropicadj.

Brit.

/ˌdʒiːəˈtrɒpɪk/,

/dʒɪəˈtrɒpɪk/,

/ˌdʒiːəˈtrəʊpɪk/,

/dʒɪəˈtrəʊpɪk/, U.S.

/ˌdʒioʊˈtrɑpɪk/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: geo- comb. form, -tropic comb. form.

Etymology: < geo- comb. form + -tropic comb. form, after German geotropisch (1868 or earlier). Compare slightly earlier geotropism n.

Botany.

Of or relating to geotropism; involving or exhibiting geotropism.

ΘΚΠ

the world > plants > part of plant > growth, movement, or curvature of parts > [adjective] > undergoing tropism

geotropic1875

heliotropic1875

paratonic1875

apheliotropic1880

apogeotropic1880

nyctitropic1880

paraheliotropic1880

plagiotropic1882

phototropic1883

selenotropic1883

rheotropic1884

orthotropic1885

thermotropic1885

haptotropic1888

traumatropic1898

plagiotropous1900

aphototropic1903

orthotropous1909

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 756 Internodes with an upward geotropic curvature.

1891 Nature 27 Aug. 409 Roots and other positively geotropic organs bend owing to plasticity.

1917 Bot. Gaz. 63 50 In other plants the hypothetical geotropic substance might be associated with the shoot-forming hormone.

1950 L. E. Hawker Physiol. Fungi ii. 26 Many fruit-bodies show either geotropic or phototropic response during their development.

1992 M. Ingrouille Diversity & Evol. Land Plants 213 Some orchids have negatively geotropic basal aerial roots.

2005 Plant Physiol. 137 1230/1 Examples include the geotropic peg and pod development of peanut.

Derivatives

ˌgeoˈtropically adv.

ΘΚΠ

the world > plants > part of plant > growth, movement, or curvature of parts > [adverb]

sinistrally1854

heliotropically1875

apheliotropically1880

apogeotropically1880

geotropically1880

paratonically1880

basifugally1882

sinistrorsally1884

phototropically1899

plagiotropously1900

hydrotropically1915

basipetally1939

1880 C. Darwin & F. Darwin Power of Movement in Plants xii. 557 These petioles bend down geotropically like a root and penetrate the ground.

1922 Amer. Botanist 28 159 The position of each separate flower is determined geotropically.

2002 Willdenowia 32 77 The slender pedicels bend downwards geotropically to place their diaspores in rock fissures and soil pockets.

This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022).

单词	geotropic
释义	geotropicadj. Brit. /ˌdʒiːəˈtrɒpɪk/, /dʒɪəˈtrɒpɪk/, /ˌdʒiːəˈtrəʊpɪk/, /dʒɪəˈtrəʊpɪk/, U.S. /ˌdʒioʊˈtrɑpɪk/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: geo- comb. form, -tropic comb. form. Etymology: < geo- comb. form + -tropic comb. form, after German geotropisch (1868 or earlier). Compare slightly earlier geotropism n. Botany. Of or relating to geotropism; involving or exhibiting geotropism. ΘΚΠ the world > plants > part of plant > growth, movement, or curvature of parts > [adjective] > undergoing tropism geotropic1875 heliotropic1875 paratonic1875 apheliotropic1880 apogeotropic1880 nyctitropic1880 paraheliotropic1880 plagiotropic1882 phototropic1883 selenotropic1883 rheotropic1884 orthotropic1885 thermotropic1885 haptotropic1888 traumatropic1898 plagiotropous1900 aphototropic1903 orthotropous1909 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 756 Internodes with an upward geotropic curvature. 1891 Nature 27 Aug. 409 Roots and other positively geotropic organs bend owing to plasticity. 1917 Bot. Gaz. 63 50 In other plants the hypothetical geotropic substance might be associated with the shoot-forming hormone. 1950 L. E. Hawker Physiol. Fungi ii. 26 Many fruit-bodies show either geotropic or phototropic response during their development. 1992 M. Ingrouille Diversity & Evol. Land Plants 213 Some orchids have negatively geotropic basal aerial roots. 2005 Plant Physiol. 137 1230/1 Examples include the geotropic peg and pod development of peanut. Derivatives ˌgeoˈtropically adv. ΘΚΠ the world > plants > part of plant > growth, movement, or curvature of parts > [adverb] sinistrally1854 heliotropically1875 apheliotropically1880 apogeotropically1880 geotropically1880 paratonically1880 basifugally1882 sinistrorsally1884 phototropically1899 plagiotropously1900 hydrotropically1915 basipetally1939 1880 C. Darwin & F. Darwin Power of Movement in Plants xii. 557 These petioles bend down geotropically like a root and penetrate the ground. 1922 Amer. Botanist 28 159 The position of each separate flower is determined geotropically. 2002 Willdenowia 32 77 The slender pedicels bend downwards geotropically to place their diaspores in rock fissures and soil pockets. This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022). < adj.1875
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