Definitions from Wiktionary (superhard)

▸ adjective:  Having a very high hardness.
▸ adjective:  Highly strengthened against attack.
▸ adjective:  (not comparable, mineralogy) Having a hardness between that of boron nitride and that of diamond.
▸ noun:  (motor racing) A tyre whose compound is harder than a normal hard tyre.




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