pleochroicadj.

Brit.

/ˌplɪəˈkrəʊɪk/, U.S.

/ˌpliəˈkroʊɪk/

Origin: A borrowing from Greek, combined with English elements. Etymons: pleo- comb. form, Greek χρώς , -ic suffix.

Etymology: < pleo- comb. form + ancient Greek χρώς colour ( < the same base as χρῶμα colour: see chrome n.) + -ic suffix, after pleochroism n. Compare dichroic adj., polychroic adj., trichroic adj.

Crystallography and Mineralogy.

Of, relating to, or exhibiting pleochroism; showing different colours when viewed in different crystallographic directions; either dichroic or trichroic.

ΘΚΠ

the world > matter > colour > variegation > iridescence > [adjective] > pleochroic

pleochroic1854

polychroic1861

pleochromatic1864

pleochroous1864

pleochroitic1879

1854 J. D. Dana Syst. Mineral. (ed. 4) 166 Monometric crystals are sometimes pleochroic, the color differing in the direction of unlike diagonals.

1893 A. Zimmerman Bot. Microtechnique 121 These crystals are strongly doubly refractive and so far pleochroic that they appear quite colorless in a certain position.

1929 W. F. Foshag in G. P. Merrill Minerals from Earth & Sky ii. iii. 180 Strongly pleochroic stones may be cut to show a dual color pattern.

1933 Mineral. Mag. 23 417 The pleochroic colours shown by the mineral in thin section.

1993 Jrnl. Petrol. 34 408 Selected pyroxenes are of millimetre size and exhibit zonation from colourless or pale green cores to slightly pleochroic greenish rims.

Compounds

pleochroic halo n. a spherical shell of colour surrounding and produced by a radioactive inclusion in certain minerals, manifesting in section as a ring or halo; usually in plural.

ΘΚΠ

the world > the earth > minerals > mineral structure or appearance > [noun] > pleochroic halo

pleochroic halo1894

radiohalo1920

the world > matter > chemistry > crystallography (general) > crystal (general) > crystal inclusions > [noun] > radioactive inclusion

pleochroic halo1894

radiohalo1920

1894 Naturalist 68 Pleochroic haloes, surrounding minute zircon crystals, are seen in both micas.

1972 M. H. Battey Mineral. for Students iii. 93/2 Small crystals of zircon, containing thorium, embedded in biotite, may by their α-radiation produce an intensely pleochroic halo.

1999 Belfast News Let. (Nexis) 19 Oct. (Features section) 17 We could consider the Earth's magnetic field.., pleochroic halos..star clusters, fossil graveyards... They all testify against evolution.

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

单词	pleochroic
释义	pleochroicadj. Brit. /ˌplɪəˈkrəʊɪk/, U.S. /ˌpliəˈkroʊɪk/ Origin: A borrowing from Greek, combined with English elements. Etymons: pleo- comb. form, Greek χρώς , -ic suffix. Etymology: < pleo- comb. form + ancient Greek χρώς colour ( < the same base as χρῶμα colour: see chrome n.) + -ic suffix, after pleochroism n. Compare dichroic adj., polychroic adj., trichroic adj. Crystallography and Mineralogy. Of, relating to, or exhibiting pleochroism; showing different colours when viewed in different crystallographic directions; either dichroic or trichroic. ΘΚΠ the world > matter > colour > variegation > iridescence > [adjective] > pleochroic pleochroic1854 polychroic1861 pleochromatic1864 pleochroous1864 pleochroitic1879 1854 J. D. Dana Syst. Mineral. (ed. 4) 166 Monometric crystals are sometimes pleochroic, the color differing in the direction of unlike diagonals. 1893 A. Zimmerman Bot. Microtechnique 121 These crystals are strongly doubly refractive and so far pleochroic that they appear quite colorless in a certain position. 1929 W. F. Foshag in G. P. Merrill Minerals from Earth & Sky ii. iii. 180 Strongly pleochroic stones may be cut to show a dual color pattern. 1933 Mineral. Mag. 23 417 The pleochroic colours shown by the mineral in thin section. 1993 Jrnl. Petrol. 34 408 Selected pyroxenes are of millimetre size and exhibit zonation from colourless or pale green cores to slightly pleochroic greenish rims. Compounds pleochroic halo n. a spherical shell of colour surrounding and produced by a radioactive inclusion in certain minerals, manifesting in section as a ring or halo; usually in plural. ΘΚΠ the world > the earth > minerals > mineral structure or appearance > [noun] > pleochroic halo pleochroic halo1894 radiohalo1920 the world > matter > chemistry > crystallography (general) > crystal (general) > crystal inclusions > [noun] > radioactive inclusion pleochroic halo1894 radiohalo1920 1894 Naturalist 68 Pleochroic haloes, surrounding minute zircon crystals, are seen in both micas. 1972 M. H. Battey Mineral. for Students iii. 93/2 Small crystals of zircon, containing thorium, embedded in biotite, may by their α-radiation produce an intensely pleochroic halo. 1999 Belfast News Let. (Nexis) 19 Oct. (Features section) 17 We could consider the Earth's magnetic field.., pleochroic halos..star clusters, fossil graveyards... They all testify against evolution. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < adj.1854
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