The Collaborative International Dictionary
Rhombohedral system
Rhombohedral \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.