1. disphenoid - Noun
2. disphenoid - Adjective
(mineralogy) Of or pertaining to a wedge-shaped crystal form of the tetragonal or orthorhombic system.
(mineralogy) Of or pertaining to a crystal form bounded by eight scalene triangles arranged in pairs, constituting a tetragonal scalenohedron.
disphenoid (plural disphenoids)
(geometry) A non-regular tetrahedron whose four faces are congruent acute-angled triangles.