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adamant

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adamant

Main Entry:: ¹ad·a·mant
Pronunciation:: \ˈa-də-mənt, -ˌmant\
Function:: noun
Etymology:: Middle English, from Anglo-French, from Latin adamant-, adamas hardest metal, diamond, from Greek
Date:: 14th century

1 : a stone (as a diamond) formerly believed to be of impenetrable hardness 2 : an unbreakable or extremely hard substance

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