a pyramidal form of the rhombohedral system in which the faces form scalene triangles
scalenohedron in American English
(skeiˌlinəˈhidrən)
nounWord forms: plural-drons or -dra (-drə)
Crystallography
a hemihedral crystal form of 8 or 12 faces, each face being a scalene triangle
Derived forms
scalenohedral
adjective
Word origin
[1850–55; ‹ Gk skalēnó(s) unequal + -hedron]This word is first recorded in the period 1850–55. Other words that entered Englishat around the same time include: clear-cut, headhunting, overprint, proletariat, runoff