allochromaticadj.

Brit.

/ˌalə(ʊ)krə(ʊ)ˈmatɪk/, U.S.

/ˌæloʊkrəˈmædɪk/,

/ˌæləkrəˈmædɪk/

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

Etymology: < allo- comb. form + chromatic adj., after German allochromatisch ( C. F. Naumann Elemente der Mineralogie (1846) 127).

Chiefly Mineralogy.

Changeable in colour; many-coloured; (of a mineral) deriving its colour or optical properties from a minor impurity that is not an essential part of its composition; cf. idiochromatic adj.

ΚΠ

1849 J. Nicol Man. Mineral. i. ii. 67 Many varieties of these minerals are occasionally coloured or allochromatic.

1879 New Sydenham Soc. Lexicon Allochromatic, changing colour, causing or depending on a change of colour.

1932 Rev. Mod. Physics 4 724 Some [crystals] owe their sensitiveness to commingled impurities, or acquire it through irradiation by x-rays or other agencies... The latter [are called] allochromatic.

1966 R. Webster Pract. Gemmol. (ed. 4) viii. 79 When the colour is caused by a trace of an accidental impurity the mineral is termed allochromatic.

2005 A. Gillis Irish Poetry 1930s iii. 59 In Autumn Journal, Ireland is, in fact, represented in MacNeice's hallmark style as an impressionistic montage, a prism of allochromatic vivacity.

This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	allochromatic
释义	allochromaticadj. Brit. /ˌalə(ʊ)krə(ʊ)ˈmatɪk/, U.S. /ˌæloʊkrəˈmædɪk/, /ˌæləkrəˈmædɪk/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: allo- comb. form, chromatic adj. Etymology: < allo- comb. form + chromatic adj., after German allochromatisch ( C. F. Naumann Elemente der Mineralogie (1846) 127). Chiefly Mineralogy. Changeable in colour; many-coloured; (of a mineral) deriving its colour or optical properties from a minor impurity that is not an essential part of its composition; cf. idiochromatic adj. ΚΠ 1849 J. Nicol Man. Mineral. i. ii. 67 Many varieties of these minerals are occasionally coloured or allochromatic. 1879 New Sydenham Soc. Lexicon Allochromatic, changing colour, causing or depending on a change of colour. 1932 Rev. Mod. Physics 4 724 Some [crystals] owe their sensitiveness to commingled impurities, or acquire it through irradiation by x-rays or other agencies... The latter [are called] allochromatic. 1966 R. Webster Pract. Gemmol. (ed. 4) viii. 79 When the colour is caused by a trace of an accidental impurity the mineral is termed allochromatic. 2005 A. Gillis Irish Poetry 1930s iii. 59 In Autumn Journal, Ireland is, in fact, represented in MacNeice's hallmark style as an impressionistic montage, a prism of allochromatic vivacity. This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.1849
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