(n.) A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.
SPHENOID
Meaning of SPHENOID in English
Webster's English dictionary. Английский словарь Webster. 2012
(n.) A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.
Webster's English dictionary. Английский словарь Webster. 2012