Definition of "rhombohedron" []

• A prism with six faces, each a rhombus. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Its crystals have formed in a textbook rhodo shape--rhombohedron--very geometric, very distinct, with nice sharp, flat faces."
• "This lamellar twinning is of secondary origin; it may be readily produced artificially by pressure, for example, by pressing a knife into the edge of a cleavage rhombohedron."
• "The crystal of prismatic habit shown in fig. 4 is a combination of the prism m {2-1-1} and the rhombohedron e {110}; fig. 5 is a combination of the scalenohedron v {20-1} and the rhombohedron"