Adamant


Adamant in classical mythology and later works is the hardest of all substances. In ancient Greek. In fact, the English word diamond is ultimately derived from adamas, via Late Latin diamas and Old French diamant. The corresponding adjective in English is adamantine, from Latin adamantinus and Greek ἀδαμάντινος.
In the Middle Ages adamant also became confused with the magnetic rock lodestone, and a folk etymology connected it with the Latin adamare, "to love or be attached to". Another connection was the belief that adamant could block the effects of a magnet. This was addressed in chapter III of Pseudodoxia Epidemica, for instance.
Since the word diamond is now used for the hardest gemstone, the increasingly archaic term "adamant" has a mostly poetic or figurative use. In that capacity, the name, and various derivatives of it, are frequently used in popular media and fiction to refer to a very hard substance.

In mythology