phototropismn.

Brit.

/ˌfəʊtə(ʊ)ˈtrəʊpɪz(ə)m/, U.S.

/ˌfoʊdəˈtroʊˌpɪz(ə)m/

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

Etymology: < photo- comb. form + -tropism comb. form; in sense 1 probably after phototropic adj.; compare also French phototropisme (1900 or earlier), German Phototropismus (1903 or earlier), and earlier phototropy n., heliotropism n. With sense 2 compare earlier phototropy n.

1. Chiefly Biology. The directional bending or growth of a plant or sessile animal in response to light; (also, Zoology) the directional movement of a motile animal in response to light (= phototaxis n.); an instance of either of these responses. Also figurative.

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

the world > life > biology > biological processes > movement > movement in response to stimuli > [noun] > response to light

phototaxis1893

photopathy1897

heliotaxis1898

phototropism1899

photokinesis1905

photonegativity1921

photostability1926

photophily1934

1899 C. B. Davenport Exper. Morphol. ii. 437 Effect of Light upon the Direction of Growth—Phototropism. [Note] On some accounts it is unfortunate to accept this word rather than the older, more familiar term ‘heliotropism’; but..the latter is obviously unfitted to our broader view of the subject.

1900 Nature 4 Jan. 219/1 The comparative effects of flash light and steady light in producing phototropism in seedling plants.

1923 R. Graves Whipperginny 38 Watch the blind Phototropisms of my fluttering mind.

1965 B. E. Freeman tr. A. Vandel Biospeleol. xxv. 400 Light very frequently attracts or repels animals and these conditions are given the names of positive and of negative phototropism.

1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxii. 182/2 Larval life may last a few hours to several days, the larva showing initially positive phototropism and negative geotropism.

1998 N.Y. Times Mag. 29 Mar. 50/2 He turned his chair to face straight into the sun; he has a phototropism that seems to amount to a form of homesickness.

2. Chemistry. = photochromism n.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [noun] > study of chemical action of light > change of colour by specific exposure

phototropy1900

phototropism1921

photochromism1951

photochromy1951

tenebrescence1953

photochromicity1966

1921 Jrnl. Amer. Chem. Soc. 43 333 (heading) Studies on phototropism in solution.

1952 K. Venkataraman Chem. Synthetic Dyes II. xl. 1217 A review of phototropism in solution and on dyed textiles.

1962 J. T. Marsh Self-smoothing Fabrics xviii. 298 Phototropism is the change in shade which occurs on exposure to strong light, followed by a gradual return to the original shade when the light is removed.

1974 I. D. Rattee & M. M. Breuer Physical Chem. of Dye Adsorption vii. 229 Three dyes..were all found to exhibit phototropism on cellulose acetate film.

This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).

单词	phototropism
释义	phototropismn. Brit. /ˌfəʊtə(ʊ)ˈtrəʊpɪz(ə)m/, U.S. /ˌfoʊdəˈtroʊˌpɪz(ə)m/ Origin: Formed within English, by compounding. Etymons: photo- comb. form, -tropism comb. form. Etymology: < photo- comb. form + -tropism comb. form; in sense 1 probably after phototropic adj.; compare also French phototropisme (1900 or earlier), German Phototropismus (1903 or earlier), and earlier phototropy n., heliotropism n. With sense 2 compare earlier phototropy n. 1. Chiefly Biology. The directional bending or growth of a plant or sessile animal in response to light; (also, Zoology) the directional movement of a motile animal in response to light (= phototaxis n.); an instance of either of these responses. Also figurative. 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 the world > life > biology > biological processes > movement > movement in response to stimuli > [noun] > response to light phototaxis1893 photopathy1897 heliotaxis1898 phototropism1899 photokinesis1905 photonegativity1921 photostability1926 photophily1934 1899 C. B. Davenport Exper. Morphol. ii. 437 Effect of Light upon the Direction of Growth—Phototropism. [Note] On some accounts it is unfortunate to accept this word rather than the older, more familiar term ‘heliotropism’; but..the latter is obviously unfitted to our broader view of the subject. 1900 Nature 4 Jan. 219/1 The comparative effects of flash light and steady light in producing phototropism in seedling plants. 1923 R. Graves Whipperginny 38 Watch the blind Phototropisms of my fluttering mind. 1965 B. E. Freeman tr. A. Vandel Biospeleol. xxv. 400 Light very frequently attracts or repels animals and these conditions are given the names of positive and of negative phototropism. 1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxxii. 182/2 Larval life may last a few hours to several days, the larva showing initially positive phototropism and negative geotropism. 1998 N.Y. Times Mag. 29 Mar. 50/2 He turned his chair to face straight into the sun; he has a phototropism that seems to amount to a form of homesickness. 2. Chemistry. = photochromism n. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [noun] > study of chemical action of light > change of colour by specific exposure phototropy1900 phototropism1921 photochromism1951 photochromy1951 tenebrescence1953 photochromicity1966 1921 Jrnl. Amer. Chem. Soc. 43 333 (heading) Studies on phototropism in solution. 1952 K. Venkataraman Chem. Synthetic Dyes II. xl. 1217 A review of phototropism in solution and on dyed textiles. 1962 J. T. Marsh Self-smoothing Fabrics xviii. 298 Phototropism is the change in shade which occurs on exposure to strong light, followed by a gradual return to the original shade when the light is removed. 1974 I. D. Rattee & M. M. Breuer Physical Chem. of Dye Adsorption vii. 229 Three dyes..were all found to exhibit phototropism on cellulose acetate film. This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022). < n.1899
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