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Diamond

/ˈdaɪəmənd/noun

The hardest natural substance, a crystalline form of carbon cut as a gem.

The Greek roots

ἀ-
a-
not, un-
+
δαμάζειν
damázein
to tame, subdue

Literally: untameable

The story of the word

Greek ἀδάμας named whatever the hardest known material was, sometimes a very hard steel rather than the stone. Medieval Latin reshaped adamas into diamas, probably pulled by the crowd of words beginning dia-, and Old French passed on diamant. The untouched Greek form came into English separately as adamant, which used to be a substance and is now a state of mind. δαμάζειν is cognate with tame and with indomitable.

How it travelled
Ancient Greek → Latin → Medieval Latin → Old French → English
First recorded
13th century

Same family

adamantadamantine

In a sentence

The diamond in the ring was smaller than the setting suggested.

Industrial diamond does most of the world's hard cutting.

Built on the same root

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