01 n. A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in moder…
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1.
A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in modern mineralogy it has no technical signification. It is now a rhetorical or poetical name for the embodiment of impenetrable hardness.“Opposed the rocky orb Of tenfold adamant, his ample shield.” — Milton.
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2.
Lodestone; magnet.[Obs.]“As true to thee as steel to adamant.” — Greene.