su·​per·​hard·​en ˌsü-pər-ˈhär-dᵊn How to pronounce superharden (audio)
superhardened; superhardening; superhardens

transitive verb

: to make (something) extremely hard
… enclosed in steel cases superhardened with a proprietary technology by a company that treats jet turbine blades …Richard Nalley
superhardened missile silos

Word History

First Known Use

1874, in the meaning defined above

Time Traveler
The first known use of superharden was in 1874

Dictionary Entries Near superharden

Cite this Entry

“Superharden.” Dictionary, Merriam-Webster, Accessed 26 May. 2024.

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