geotropismn.

Brit.

/ˌdʒiːəʊˈtrəʊpɪz(ə)m/,

/dʒɪəˈtrəʊpɪz(ə)m/, U.S.

/ˌdʒiəˈtrɑˌpɪz(ə)m/

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

Etymology: < geo- comb. form + -tropism comb. form, after German Geotropismus ( A. B. Frank Beiträge zur Pflanzenphysiol. (1868) ix. 85). Compare slightly later geotropic adj.

Chiefly Botany.

The directional growth of a plant or (less commonly) a sessile animal in response to gravity; (also) the directional movement of a motile animal in response to gravity (= geotaxis n.); an instance of any of these responses.C. and F. Darwin used the word in a narrower sense to mean positive geotropism, the term apogeotropism being used for negative geotropism.

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

1873 Jrnl. Bot., Brit. & Foreign 11 95 A. B. Frank, ‘On Transverse Geotropism and Heliotropism’.

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 758 The positive or negative character of geotropism depends as little as that of heliotropism on the morphological nature of the organ.

1880 F. Darwin in Nature 23 Dec. 179/1 The phenomena might result from the ordinary forms of heliotropism and geotropism acting in concert.

1908 C. B. Davenport Exper. Morphol. (new ed.) xv. 403 Among animals, hydroids show negative geotropism.

1916 W. F. Ganong Textbk. Bot. for Colleges i. v. 249 The tertiary and later formed roots have so weak a geotropism that they respond to other stimuli very freely.

1950 L. E. Hawker Physiol. Fungi vi. 193 The most frequent references to geotropism in fungi relate to the fruit-bodies of the higher Basidiomycetes.

1955 Times 6 Oct. 10/6 Obeying an inborn tendency to move upwards, a ‘negative geotropism’ as the biologist calls it, the gossamer spider climbs a stalk.

2001 Ann. Bot. 88 1177 (caption) Root-like stolons break through the bottom of the pot and show positive geotropism.

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

单词	geotropism
释义	geotropismn. Brit. /ˌdʒiːəʊˈtrəʊpɪz(ə)m/, /dʒɪəˈtrəʊpɪz(ə)m/, U.S. /ˌdʒiəˈtrɑˌpɪz(ə)m/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: geo- comb. form, -tropism comb. form. Etymology: < geo- comb. form + -tropism comb. form, after German Geotropismus ( A. B. Frank Beiträge zur Pflanzenphysiol. (1868) ix. 85). Compare slightly later geotropic adj. Chiefly Botany. The directional growth of a plant or (less commonly) a sessile animal in response to gravity; (also) the directional movement of a motile animal in response to gravity (= geotaxis n.); an instance of any of these responses.C. and F. Darwin used the word in a narrower sense to mean positive geotropism, the term apogeotropism being used for negative geotropism. 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 1873 Jrnl. Bot., Brit. & Foreign 11 95 A. B. Frank, ‘On Transverse Geotropism and Heliotropism’. 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 758 The positive or negative character of geotropism depends as little as that of heliotropism on the morphological nature of the organ. 1880 F. Darwin in Nature 23 Dec. 179/1 The phenomena might result from the ordinary forms of heliotropism and geotropism acting in concert. 1908 C. B. Davenport Exper. Morphol. (new ed.) xv. 403 Among animals, hydroids show negative geotropism. 1916 W. F. Ganong Textbk. Bot. for Colleges i. v. 249 The tertiary and later formed roots have so weak a geotropism that they respond to other stimuli very freely. 1950 L. E. Hawker Physiol. Fungi vi. 193 The most frequent references to geotropism in fungi relate to the fruit-bodies of the higher Basidiomycetes. 1955 Times 6 Oct. 10/6 Obeying an inborn tendency to move upwards, a ‘negative geotropism’ as the biologist calls it, the gossamer spider climbs a stalk. 2001 Ann. Bot. 88 1177 (caption) Root-like stolons break through the bottom of the pot and show positive geotropism. This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022). < n.1873
随便看	lop and crop lop and top lop down lop out lop-brimmed lop-ear lop-eared lop-eaves lop-grass lop-heavy lop-limbed lop-rabbit lop-stick lop-web lop-wood lopbrimmed lope log-fence log-fire log-fish log-glass log-guard log-hauler log-hauling log-head