Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for adamas
This was a material invented by Mr. Leoni, and named by him "adamas."Gas Burners
The Greeks name it Adamas,—which signifieth, the invincible.Sulamith: A Romance of Antiquity
The name Diamond comes from the Greek adamas, which means unconquerable.
This is expressly said by Hesychius, and many epithets derived from adamas are applied to articles made of steel or of iron.
But it seems to be less known that adamas also at first denoted steel.