trapezohedronn.
/ˌtrapɪzə(ʊ)ˈhiːdrən//ˌtrapɪzə(ʊ)ˈhɛdrən/ Geometry and Crystallography.
A solid figure whose faces are trapeziums or trapezoids; as the icositetrahedron or deltohedron, with 24 faces, and the trigonal trapezohedron, with 6.
ΘΚΠ
the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > contained by quadrilaterals
trapezoid1704
trapezohedron1822
1822 P. Cleaveland Elem. Treat. Mineral. & Geol. (ed. 2) I. 361 Another form [in garnet] is a trapezoedron, or a solid presenting twenty four equal and similar, trapezoidal faces.
1828 N. Webster Amer. Dict. Eng. Lang. Trapezihedron, a solid bounded by twenty-four equal and similar trapeziums.
1847 Webster's Amer. Dict. Eng. Lang. Trapezohedron.
1895 N. Story-Maskelyne Crystallogr. vii. §257 The trigonal trapezohedron.
1895 N. Story-Maskelyne Crystallogr. vii. §274 The trapezohedra that occur on quartz belong to two correlative groups.
Derivatives
ˌtrapezoˈhedral adj. pertaining to or of the form of a trapezohedron.
ΘΚΠ
the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having faces of particular shape
trapezoidal1794
trapezoidiform1826
rhombohedric1830
pentagonal1837
trapezohedral1849
trigonal1878
1849 J. D. Dana U.S. Exploring Exped.: Geol. (1850) xvii. 628 Garnet in trapezohedral crystals.
1868 J. D. Dana Syst. Mineral. (ed. 5) 189 Quartz... Various trapezohedral forms... Many trapezohedrons in other positions.
1895 N. Story-Maskelyne Crystallogr. vii. §273 The trapezohedral tetartohedron.
This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2022).
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n.1822