actinicadj.

Brit.

/akˈtɪnɪk/, U.S.

/ækˈtɪnɪk/

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ἀκτῖν- , ἀκτίς , -ic suffix.

Etymology: < ancient Greek ἀκτῖν-, ἀκτίς ray (see actino- comb. form) + -ic suffix.

1. Of or relating to actinism; (of light) having the ability to cause a chemical change; having a relatively high ultraviolet content; = photogenic adj. 1.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > solar radiation > [adjective] > relating to activism

actinic1845

the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [adjective] > of or affected by rays causing chemical changes

tithonized1843

actinic1845

1845 J. F. W. Herschel in Rep. Brit. Assoc. Advancem. Sci. 1844 13 While the actinic influence is still fresh upon the face (i.e. as soon as it is removed from the light).

1859 Bentley's Q. Rev. No. 3. 157 The actinic force, or that of the violet end of the spectrum, quickens germination much more than the luminous.

1871 H. Macmillan True Vine 124 We produce photographs by a power in the sunbeam called the chemical, or actinic power.

1938 R. Hum Chem. for Engin. Students xxii. 591 When heated in air, the metal burns with a brilliant white light, rich in the actinic rays which affect photographic plates.

1952 Electronic Engin. 24 583 A 6 in. diameter screen with low persistence coating, giving a blue-green trace of high actinic value.

1972 McGraw-Hill Yearbk. Sci. & Technol. 1971 341/2 High-pressure mercury arc lamps..emit actinic radiation down to about 3200 A (320 nm) if the tubes are made of glass.

2004 Plant Physiol. 136 3309/2 This actinic lamp had a spectral emission rich in red light relative to the white fluorescent growth light.

2. Esp. of a medical condition: produced or caused by the action of light; = photogenic adj. 2.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [adjective] > produced by light

spectral1839

actinic1850

photogenic1870

photoproduced1953

1850 Proc. Royal Soc. Edinb. 2 184 Another comparative experiment was not so successful as regarded rapidity of actinic bleaching.

1899 T. C. Allbutt Syst. Med. VIII. 700 Freckles may be considered as actinic melanoses.

1956 Nature 30 June 1241/2 Fibres from exposed fabrics..show actinic damage but no fungal damage.

1997 J. Updike Toward End of Time 208 He painfully squirted liquid nitrogen onto a few spots of actinic damage on my face.

2007 Rosacea Rev. (National Rosacea Soc.) Winter 2/1 Actinic keratosis (precancerous rough spots from sun damage).

Compounds

actinic focus n. Photography and Optics (now rare) (with reference to a lens or other optical system) the focal point (focal point n. 1a) or focal distance for actinic light; = chemical focus n. at chemical adj. and n. Compounds 3.If chromatic aberration has not been corrected, the actinic focus may differ from the focus of visible light.

ΚΠ

1848 Art-union May 134/3 Having observed the point at which the most perfect picture is visible, it is necessary to..shorten the focus very slightly to bring the tablet to the actinic focus.

1890 W. E. Woodbury Encycl. Photogr. 293 Unless the lens be rendered achromatic, the actinic or chemical focus does not coincide with the visual focus.

1901 Photo-miniature Oct. 304 In these [lenses] the difference between the visual and the actinic focus was often twelve inches or more.

1971 Technol. & Culture 12 193 Rutherford located the photographic plate at the actinic focus of the telescope, ⁷/ ₁₀ inches outside the visual focus.

Derivatives

acˈtinically adv. as regards actinic power; like actinic light.

ΚΠ

1858 D. Brewster Kaleidoscope (ed. 2) xxi. 152 Blue glasses, which transmit no red rays, are actinically more luminous than colourless glasses.

1883 Proc. Royal Soc. 35 297 The dark space in the discharge in vacuum tubes is only relatively actinically dark..and they succeeded in obtaining a photograph of the dark space.

1962 L. Rudaux & G. De Vaucouleurs Larousse Encycl. Astron. (ed. 2) x. 262 The limb regions [of the Sun] are not only less intense but are also redder, and therefore less actinically effective than the centre.

1991 S. Larsen & R. Larsen Fire in Mind iv. xxv. 540 Lightning effects flickered actinically throughout the vastness of the auditorium.

This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).

单词	actinic
释义	actinicadj. Brit. /akˈtɪnɪk/, U.S. /ækˈtɪnɪk/ Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ἀκτῖν- , ἀκτίς , -ic suffix. Etymology: < ancient Greek ἀκτῖν-, ἀκτίς ray (see actino- comb. form) + -ic suffix. 1. Of or relating to actinism; (of light) having the ability to cause a chemical change; having a relatively high ultraviolet content; = photogenic adj. 1. ΘΚΠ the world > matter > physics > electromagnetic radiation > solar radiation > [adjective] > relating to activism actinic1845 the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [adjective] > of or affected by rays causing chemical changes tithonized1843 actinic1845 1845 J. F. W. Herschel in Rep. Brit. Assoc. Advancem. Sci. 1844 13 While the actinic influence is still fresh upon the face (i.e. as soon as it is removed from the light). 1859 Bentley's Q. Rev. No. 3. 157 The actinic force, or that of the violet end of the spectrum, quickens germination much more than the luminous. 1871 H. Macmillan True Vine 124 We produce photographs by a power in the sunbeam called the chemical, or actinic power. 1938 R. Hum Chem. for Engin. Students xxii. 591 When heated in air, the metal burns with a brilliant white light, rich in the actinic rays which affect photographic plates. 1952 Electronic Engin. 24 583 A 6 in. diameter screen with low persistence coating, giving a blue-green trace of high actinic value. 1972 McGraw-Hill Yearbk. Sci. & Technol. 1971 341/2 High-pressure mercury arc lamps..emit actinic radiation down to about 3200 A (320 nm) if the tubes are made of glass. 2004 Plant Physiol. 136 3309/2 This actinic lamp had a spectral emission rich in red light relative to the white fluorescent growth light. 2. Esp. of a medical condition: produced or caused by the action of light; = photogenic adj. 2. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [adjective] > produced by light spectral1839 actinic1850 photogenic1870 photoproduced1953 1850 Proc. Royal Soc. Edinb. 2 184 Another comparative experiment was not so successful as regarded rapidity of actinic bleaching. 1899 T. C. Allbutt Syst. Med. VIII. 700 Freckles may be considered as actinic melanoses. 1956 Nature 30 June 1241/2 Fibres from exposed fabrics..show actinic damage but no fungal damage. 1997 J. Updike Toward End of Time 208 He painfully squirted liquid nitrogen onto a few spots of actinic damage on my face. 2007 Rosacea Rev. (National Rosacea Soc.) Winter 2/1 Actinic keratosis (precancerous rough spots from sun damage). Compounds actinic focus n. Photography and Optics (now rare) (with reference to a lens or other optical system) the focal point (focal point n. 1a) or focal distance for actinic light; = chemical focus n. at chemical adj. and n. Compounds 3.If chromatic aberration has not been corrected, the actinic focus may differ from the focus of visible light. ΚΠ 1848 Art-union May 134/3 Having observed the point at which the most perfect picture is visible, it is necessary to..shorten the focus very slightly to bring the tablet to the actinic focus. 1890 W. E. Woodbury Encycl. Photogr. 293 Unless the lens be rendered achromatic, the actinic or chemical focus does not coincide with the visual focus. 1901 Photo-miniature Oct. 304 In these [lenses] the difference between the visual and the actinic focus was often twelve inches or more. 1971 Technol. & Culture 12 193 Rutherford located the photographic plate at the actinic focus of the telescope, ⁷/ ₁₀ inches outside the visual focus. Derivatives acˈtinically adv. as regards actinic power; like actinic light. ΚΠ 1858 D. Brewster Kaleidoscope (ed. 2) xxi. 152 Blue glasses, which transmit no red rays, are actinically more luminous than colourless glasses. 1883 Proc. Royal Soc. 35 297 The dark space in the discharge in vacuum tubes is only relatively actinically dark..and they succeeded in obtaining a photograph of the dark space. 1962 L. Rudaux & G. De Vaucouleurs Larousse Encycl. Astron. (ed. 2) x. 262 The limb regions [of the Sun] are not only less intense but are also redder, and therefore less actinically effective than the centre. 1991 S. Larsen & R. Larsen Fire in Mind iv. xxv. 540 Lightning effects flickered actinically throughout the vastness of the auditorium. This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021). < adj.1845
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