pyritohedron

noun

py·​ri·​to·​he·​dron

-drən sometimes -ˌdrän

plural pyritohedrons or pyritohedra

: a pentagonal dodecahedron that is a hemihedral form of the isometric system of crystalline symmetry common to pyrite

Word History

Etymology

New Latin, from pyrito- (from International Scientific Vocabulary pyrite) + -hedron

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!