diamond
A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron.
Example
“The saw is coated with diamond.”
Other meanings
A gemstone made from this mineral.
“The dozen loose diamonds sparkled in the light.”
A diamond ring.
“What a beautiful engagement diamond.”
Word history
From Ancient Greek "ἀδάμᾱς".
Where this comes from
This definition is adapted from “diamond” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.