trapezohedron


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tra·pe·zo·he·dron

 (trə-pē′zō-hē′drən, trăp′ĭ-zō-)
n. pl. tra·pe·zo·he·drons or tra·pe·zo·he·dra (-drə)
Any of several forms of crystal with trapeziums as faces.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

trapezohedron

(trəˌpiːzəʊˈhiːdrən)
n, pl -drons or -dra (-drə)
(Chemistry) crystallog a crystal form in which all the crystal's faces are trapeziums
[C19: from trapezo- combining form of trapezium + -hedron, on the model of tetrahedron]
traˌpezoˈhedral adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

tra•pe•zo•he•dron

(trəˌpi zəˈhi drən, ˌtræp ə-)

n., pl. -drons, -dra (-drə)
a crystal form having all faces trapeziums.
[1810–20]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.trapezohedron - a polyhedron whose faces are trapeziumstrapezohedron - a polyhedron whose faces are trapeziums
polyhedron - a solid figure bounded by plane polygons or faces
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Or if the Shining Trapezohedron in the abandoned church can summon a winged demon?
This problem consists of computing the total charge of a trapezohedron at 1V from the induced charge on its surface.
The most common forms are the dodecahedron {110} and trapezohedron {211} in various combinations, the first being more typical for demantoid and the second for topazolite.
In the tower of the now abandoned yet accursed church where a malevolent cult called Starry Wisdom once congregated in "The Haunter of the Dark," the narrator recounts how Robert Blake, the story's protagonist, finds an object referred to as the Shining Trapezohedron suspended inside a small box whose artistry and peculiarity underscore the value of the object it contains: "He noticed odd bas-reliefs on the strange open box of yellowish metal [...] the figurings [sic] were of a monstrous and utterly alien kind; depicting entities which, though seeming alive, resembled no known life-form ever evolved on this planet" ("Haunter," 102, emphasis added).
(2) En el cuento citado, "The Haunter in the Dark" (1935), hay otras referencias semejantes: "there are references to a Haunter of the Dark awakened by gazing into the Shining Trapezohedron, and insane conjectures about the black gulfs of chaos from which it was called" (The Call 350); "the monstrous thing of night which his rashness had called out of the ultimate black spaces" (353); "he thought of the ancient legends of Ultimate Chaos" (354).
The thumbnail-size almandine crystals are lustrous, partially gemmy, red-brown combinations of the dodecahedron and trapezohedron forms, with nice internal highlights.
The following forms were identified: the rhombic dodecahedron, the pyritohedron, the trapezohedron, several dyakis dodecahedra, and probably the triakis octahedron [= trisoctahedron], Wagner stated that the Tweefontein sperrylite crystals are typically 1.3 mm to 1.7 cm in size.
One of the clefts also yielded colorless, transparent fluorite octahedrons, modified by dodecahedron and trapezohedron faces, to 2 cm; good crystals of adularian orthoclase, smoky quartz and white tabular calcite also came from both clefts (Burgsteiner, 1989; Niedermayr, 1990).
Forms present are the cube (a), octahedron (o), dodecahedron (d), tetrahexahedron (e) {012}, trapezohedron (m) {113}, trisoctahedron (q) {133}, and hexoctahedron (t) {124}.
Enantiomorphic "handedness" is revealed by the trapezohedron face x in its right x'{161} or left 'x{151} position (see Figs.
There is also--and this is part of what I meant earlier by "playful"--a piece by Erich Offermann and Pete Richards called "Fluorite Balls From Hell," in which a computer-enabled, almost insanely detailed crystallographic analysis is offered of tiny fluorite crystals from Germany which typically look like spheres because they combine the hexoctahedron (48 faces), tetrahexahedron (24 faces), cube, dodecahedron, trapezohedron and (for all I could tell, on a quick read) even more isometric forms, all in more or less equal development.
He also noticed that the presence and orientation of the composite x or 'x trigonal trapezohedron face (see later) betrays the handedness of the gwindel (Weiss, 1836).