1. A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substance of extreme hardness; but in modern minerology 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)
2. Lodestone; magnet. A great adamant of acquaintance. As true to thee as steel to adamant. (Greene)
Origin: oe. Adamaunt, adamant, diamond, magnet, OF. Adamant, L. Adamas, adamantis, the hardest metal, fr. Gr,; priv. – to tame, subdue. In oe, from confusion with L. Adamare to love, be attached to, the word meant also magnet, as in OF. And LL. See diamond, tame.