rhombohedraladj.

Brit.

/ˌrɒmbəˈhiːdr(ə)l/, U.S.

/ˌrɑmboʊˈhidrəl/

Origin: Formed within English, by compounding. Etymons: rhombo- comb. form, -hedral comb. form.

Etymology: < rhombo- comb. form + -hedral comb. form. Compare rhombohedron n.

Chiefly Crystallography.

Relating to or having the form of a rhombohedron; having a unit cell which is a rhombohedron; spec. designating a branch of the hexagonal crystal system characterized by the presence of a threefold symmetry axis (also called trigonal).

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > crystal systems > [adjective] > rhombohedral

rhombohedral1816

1816 Synopsis Contents Brit. Mus. (ed. 7) 22 Chabasite or chabasie, in groups of primitive rhombohedral and modified crystals.

1820 F. Mohs Char. Nat. Hist. Syst. Min. 53 Pearl-Mica. Rhombohedral.

1857 C. U. Shepard Treat. Mineral. (ed. 3) ii. 427 Lindackerite [occurs]..in oblong, rhombohedral tables.

1881 Nature 18 Aug. 355/1 Prof. Tschermak has adopted the four-plane axial system in the rhombohedral system.

1925 H. C. Booth tr. F. Auerbach Mod. Magnetics (U.K. ed.) vi. 135 By means of a rhombohedral calc-spar crystal two images were produced, one exactly above the other.

1966 R. Webster Pract. Gemmol. (ed. 4) iii. 28 The usual habit of diamond is octahedral; that of ruby rhombohedral.

2008 Rock & Gem Apr. 89/1 Another huge case held Sweet Home Mine rhodochrosites, each specimen endowed with magnificent, fiery red rhombohedral crystals.

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	rhombohedral
释义	rhombohedraladj. Brit. /ˌrɒmbəˈhiːdr(ə)l/, U.S. /ˌrɑmboʊˈhidrəl/ Origin: Formed within English, by compounding. Etymons: rhombo- comb. form, -hedral comb. form. Etymology: < rhombo- comb. form + -hedral comb. form. Compare rhombohedron n. Chiefly Crystallography. Relating to or having the form of a rhombohedron; having a unit cell which is a rhombohedron; spec. designating a branch of the hexagonal crystal system characterized by the presence of a threefold symmetry axis (also called trigonal). ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal systems > [adjective] > rhombohedral rhombohedral1816 1816 Synopsis Contents Brit. Mus. (ed. 7) 22 Chabasite or chabasie, in groups of primitive rhombohedral and modified crystals. 1820 F. Mohs Char. Nat. Hist. Syst. Min. 53 Pearl-Mica. Rhombohedral. 1857 C. U. Shepard Treat. Mineral. (ed. 3) ii. 427 Lindackerite [occurs]..in oblong, rhombohedral tables. 1881 Nature 18 Aug. 355/1 Prof. Tschermak has adopted the four-plane axial system in the rhombohedral system. 1925 H. C. Booth tr. F. Auerbach Mod. Magnetics (U.K. ed.) vi. 135 By means of a rhombohedral calc-spar crystal two images were produced, one exactly above the other. 1966 R. Webster Pract. Gemmol. (ed. 4) iii. 28 The usual habit of diamond is octahedral; that of ruby rhombohedral. 2008 Rock & Gem Apr. 89/1 Another huge case held Sweet Home Mine rhodochrosites, each specimen endowed with magnificent, fiery red rhombohedral crystals. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < adj.1816
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