Definition of disphenoid
1 : a wedge-shaped crystal form of the tetragonal or orthorhombic system having four like triangular faces that correspond in position to alternate faces of the tetragonal or orthorhombic dipyramid and being symmetrical about each of three mutually perpendicular diad axes of symmetry in all classes except the tetragonal-disphenoidal in which the form is generated by an inverse tetrad axis of symmetry
2 : a form of crystal bounded by eight scalene triangles arranged in pairs : the tetragonal scalenohedron
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of disphenoid
di- + sphenoid
Seen and Heard
What made you want to look up disphenoid? Please tell us where you read or heard it (including the quote, if possible).