noun, plural rhombohedrons, rhombohedra [rom-buh-hee-druh] .
a solid bounded by six rhombic planes.

1830–40; < Greek rhómbo(s) rhombus + -hedron

rhombohedral, adjective
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World English Dictionary
rhombohedral (ˌrɒmbəʊˈhiːdrəl)
1.  of or relating to a rhombohedron
2.  crystallog another term for trigonal

rhombohedron (ˌrɒmbəʊˈhiːdrən)
a six-sided prism whose sides are parallelograms
[C19: from rhombus + -hedron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
rhombohedral   (rŏm'bō-hē'drəl)  Pronunciation Key 
See trigonal.
rhombohedron   (rŏm'bō-hē'drən)  Pronunciation Key 
Plural rhombohedrons or rhombohedra
A prism with six faces, each a rhombus.
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