| 释义 |
trapezohedron Geom. and Cryst.|ˌtræpɪzəʊˈhiːdrən, -ˈhɛdrən|
Pl. -hedra, -hedrons. Also 9 trapezoedron, erron. trapezihedron.
[f. trapezo-, used as combining form of trapezium, after tetrahedron, etc. Cf. F. trapezoèdre (Littré).]
A solid figure whose faces are trapeziums or trapezoids; as the icositetrahedron or deltohedron, with 24 faces, and the trigonal trapezohedron, with 6. Hence ˌtrapezoˈhedral a., pertaining to or of the form of a trapezohedron.
1816–22Cleaveland Treat. Min. & Geol. (ed. 2) I. 361 Another form [in Garnet] is a trapezoedron, or a solid presenting twenty four equal and similar, trapezoidal faces. 1828Webster, Trapezihedron, a solid bounded by twenty-four equal and similar trapeziums. 1847― Trapezohedron. 1849Dana Geol. xvii. (1850) 628 Garnet in trapezohedral crystals. 1868― Min. 189 Quartz... Various trapezohedral forms... Many trapezohedrons in other positions. 1895Story-Maskelyne Crystallogr. vii. §257 The trigonal trapezohedron. Ibid. §273 The trapezohedral tetartohedron. Ibid. §274 The trapezohedra that occur on quartz belong to two correlative groups. |