phototropicadj.

Brit.

/ˌfəʊtə(ʊ)ˈtrɒpɪk/,

/ˌfəʊtə(ʊ)ˈtrəʊpɪk/, U.S.

/ˌfoʊdəˈtrɑpɪk/

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

Etymology: < photo- comb. form + -tropic comb. form. In sense 1 after French phototropique (1883 in the source reviewed in quot. 1883 at sense 1); compare earlier heliotropic adj., geotropic adj., etc. With sense 2 compare phototropy n. 2.

1. Chiefly Biology. Characterized by or exhibiting (positive or negative) phototropism; responding to light with orientated movement or growth; esp. (in general use) attracted to light, photopositive.

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

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

phototactic1882

phototropic1883

photophilous1890

photopathic1897

photophil1897

heliotactic1898

photokinetic1900

photophilic1900

1883 Amer. Naturalist 17 658 Plants of phototropic sensibility were grown from seeds in pots in a very dark place.

1903 Mark Anniversary Vol. xxiii. 455 Loeb maintained that butterflies as well as moths are positively phototropic.

1927 J. S. Huxley in R. J. S. McDowall Mind 1 23 The machine was..positively phototropic, and if you, armed with an electric torch, were left alone with it in a dark room, it would follow you about.

1941 Science 25 Apr. 408/1 Rats and mice..are negatively phototropic.

1947 H. Kuttner Fury (1963) 160 Floodlights, with charged wire-mesh shields to guard against phototropic bugs, showed part of the ground outside the wall.

1976 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 350 Phototropic behaviour is not confined to the higher plants; it occurs also in fungi and algae.

1990 D. Ackerman Nat. Hist. Senses 303 We are as phototropic as plants, smitten with the sun's light, and this should be considered a sense separate from vision.

2. Chemistry. = photochromic adj.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [adjective] > of chemical action of light > of change of colour by

photochromatic1856

photochromic1881

phototropic1900

tenebrescent1953

1900 Jrnl. Chem. Soc. 78 ii. 125 Benzilosazone, salicylosazone, and vanillylosazone are, however, not phototropic.

1971 Materials & Technol. II. vi. 410 Phototropic glass is made by melting an alkali-alumino-borosilicate glass containing some lead and small amounts of silver, chloride, bromide, and iodide, forming the glass in the normal way, and then submitting the article to a heat treatment for several hours.

1987 Jrnl. Amer. Chem. Soc. 109 6178/2 It has been shown that 2-hydroxyazobenzenes are good candidates for the kind of phototropic proton carrier envisioned above.

Derivatives

ˈphototrope n. rare a phototropic substance or organism.

ΚΠ

1912 Rep. Brit. Assoc. 432 Reversible colour changes such as those exhibited by phototropes or thermotropes.

1988 A. C. Clarke 2061: Odyssey Three 35 Perhaps it's a phototrope, its biological cycle triggered by the Sunlight that filters through the ice.

photoˈtropically 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

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

phototropically1899

phototactically1914

photokinetically1952

1899 C. B. Davenport Exper. Morphol. ii. 440 Etiolated willow shoots, upon which..the more strongly refractive rays only act phototropically.

1929 Chem. Rev. 6 257 Strontium platinocyanide which had been changed by x-rays into the phototropically excited form showed the photoelectric effect much more strongly.

1972 Plant Physiol. 49 993/1 Etiolated plants are known to be more sensitive phototropically than are green ones.

2000 Interzone Aug. 7/2 The overgrowth was shallower there, growing up and away, heading phototropically for the sun.

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

单词	phototropic
释义	phototropicadj. Brit. /ˌfəʊtə(ʊ)ˈtrɒpɪk/, /ˌfəʊtə(ʊ)ˈtrəʊpɪk/, U.S. /ˌfoʊdəˈtrɑpɪk/ Origin: Formed within English, by compounding. Etymons: photo- comb. form, -tropic comb. form. Etymology: < photo- comb. form + -tropic comb. form. In sense 1 after French phototropique (1883 in the source reviewed in quot. 1883 at sense 1); compare earlier heliotropic adj., geotropic adj., etc. With sense 2 compare phototropy n. 2. 1. Chiefly Biology. Characterized by or exhibiting (positive or negative) phototropism; responding to light with orientated movement or growth; esp. (in general use) attracted to light, photopositive. 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 the world > life > biology > biological processes > movement > movement in response to stimuli > [adjective] > response to light phototactic1882 phototropic1883 photophilous1890 photopathic1897 photophil1897 heliotactic1898 photokinetic1900 photophilic1900 1883 Amer. Naturalist 17 658 Plants of phototropic sensibility were grown from seeds in pots in a very dark place. 1903 Mark Anniversary Vol. xxiii. 455 Loeb maintained that butterflies as well as moths are positively phototropic. 1927 J. S. Huxley in R. J. S. McDowall Mind 1 23 The machine was..positively phototropic, and if you, armed with an electric torch, were left alone with it in a dark room, it would follow you about. 1941 Science 25 Apr. 408/1 Rats and mice..are negatively phototropic. 1947 H. Kuttner Fury (1963) 160 Floodlights, with charged wire-mesh shields to guard against phototropic bugs, showed part of the ground outside the wall. 1976 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 350 Phototropic behaviour is not confined to the higher plants; it occurs also in fungi and algae. 1990 D. Ackerman Nat. Hist. Senses 303 We are as phototropic as plants, smitten with the sun's light, and this should be considered a sense separate from vision. 2. Chemistry. = photochromic adj. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [adjective] > of chemical action of light > of change of colour by photochromatic1856 photochromic1881 phototropic1900 tenebrescent1953 1900 Jrnl. Chem. Soc. 78 ii. 125 Benzilosazone, salicylosazone, and vanillylosazone are, however, not phototropic. 1971 Materials & Technol. II. vi. 410 Phototropic glass is made by melting an alkali-alumino-borosilicate glass containing some lead and small amounts of silver, chloride, bromide, and iodide, forming the glass in the normal way, and then submitting the article to a heat treatment for several hours. 1987 Jrnl. Amer. Chem. Soc. 109 6178/2 It has been shown that 2-hydroxyazobenzenes are good candidates for the kind of phototropic proton carrier envisioned above. Derivatives ˈphototrope n. rare a phototropic substance or organism. ΚΠ 1912 Rep. Brit. Assoc. 432 Reversible colour changes such as those exhibited by phototropes or thermotropes. 1988 A. C. Clarke 2061: Odyssey Three 35 Perhaps it's a phototrope, its biological cycle triggered by the Sunlight that filters through the ice. photoˈtropically 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 the world > life > biology > biological processes > movement > movement in response to stimuli > [adverb] > response to light phototropically1899 phototactically1914 photokinetically1952 1899 C. B. Davenport Exper. Morphol. ii. 440 Etiolated willow shoots, upon which..the more strongly refractive rays only act phototropically. 1929 Chem. Rev. 6 257 Strontium platinocyanide which had been changed by x-rays into the phototropically excited form showed the photoelectric effect much more strongly. 1972 Plant Physiol. 49 993/1 Etiolated plants are known to be more sensitive phototropically than are green ones. 2000 Interzone Aug. 7/2 The overgrowth was shallower there, growing up and away, heading phototropically for the sun. This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022). < adj.1883
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