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n. pl. rhom·bo·he·drons or rhom·bo·he·dra (-drə)
A prism with six faces, each a rhombus.
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.


n, pl -drons or -dra (-drə)
(Mathematics) a six-sided prism whose sides are parallelograms
[C19: from rhombus + -hedron]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌrɒm bəˈhi drən)

n., pl. -drons, -dra (-drə).
a solid bounded by six rhombic planes.
[1830–40; < Greek rhómbo(s) rhombus + -hedron]
rhom`bo•he′dral, adj.
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.rhombohedron - a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)rhombohedron - a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
parallelepiped, parallelepipedon, parallelopiped, parallelopipedon - a prism whose bases are parallelograms
hexahedron - any polyhedron having six plane faces
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The backing block is a brass rhombohedron. Three orthographic schematic views are shown in Fig.
Each rhombohedron [G.sub.i] (before rotation) centered at [x.sub.i] is the intersection of three pairs of parallel planes as defined in Eq.
The calcite chips were obtained by gently striking a large calcite rhombohedron ([tilde]4 cm in length; Watkins Mineral Corp., Wichita Falls, Texas) with a razor edge, producing small rhombohedral fragments.
X-ray crystallography showed, however, that the basic unit of solid cubane is again a rhombohedron. The findings appear in the June 30 PHYSICAL REVIEW LETTERS.
Carefully detailed crystallographic study reveals that in every case what appears to be a "single" crystal, resembling a distorted rhombohedron, is actually an oriented intergrowth of several parallel twins having a common composition plane.
Calcite crystals occur in a wide variety of habits, the scalenohedron and rhombohedron being the most common forms.
The stout amethyst crystals (terminal rhombohedron faces dominating) are medium-lustrous and color-zoned, with the best, gemmiest purple tones near their tips.
Crystal habits range from elongated hexagonal prisms with low-angle rhombohedron terminations to prism and scalenohedron combinations in varying proportions.
It occurs in a wide variety of habits, but the scalenohedron and rhombohedron are the most common forms.
According to Kostov (1968) and Moroshkin and Frishman (2001), the temperature of crystallization of various calcite forms proceeds from the {10[bar.1]1} rhombohedron at high temperature to the {[bar.1][bar.1]20} prism, {21[bar.3]1} scalenohedron, and lastly the {02[bar.1]1} steep rhombohedron at low temperature.