superharden

verb
su·​per·​hard·​en | \ ˌsü-pər-ˈhär-dᵊn \
superhardened; superhardening; superhardens

Definition of superharden 

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

First Known Use of superharden

1874, in the meaning defined above

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The first known use of superharden was in 1874

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