superharden
verb
su·per·hard·en
| \ ˌsü-pər-ˈhär-dᵊn
\
\
superhardened;
superhardening;
superhardens
Definition of superharden
: 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
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