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From: Webster's Revised Unabridged Dictionary (1913)

 Rhom·bo·he·dral a. Geom. & Crystallog. Related to the rhombohedron; presenting the form of a rhombohedron, or a form derivable from a rhombohedron; relating to a system of forms including the rhombohedron and scalenohedron.
 Rhombohedral iron ore Min. See Hematite.
 Rhombohedral system Crystallog., a division of the hexagonal system embracing the rhombohedron, scalenohedron, etc.
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