rhombohedron

 
Pronunciation: /ˌrɒmbə(ʊ)ˈhiːdr(ə)n, -ˈhɛd-/

noun (plural rhombohedra /-drə/ or rhombohedrons)

  • a solid figure whose faces are six equal rhombuses.
  • a rhombohedral crystal or other solid object.

Origin:

mid 19th century: from rhombus + -hedron, on the pattern of words such as polyhedron