The Collaborative International Dictionary
Scalenohedron
Scalenohedron \Sca*le`no*he"dron\ (-dr[o^]n), n. [Gr. skalhno`s uneven + "e`dra seat, base.] (Crystallog.) A pyramidal form under the rhombohedral system, inclosed by twelve faces, each a scalene triangle.
Wiktionary
scalenohedron
n. A rhombohedral polyhedron having twelve sides, each in the form of a scalene triangle.