superharden
verb
su·per·hard·en
ˌsü-pər-ˈhär-dᵊn 
superhardened; superhardening; superhardens
: to make (something) extremely hard
… enclosed in steel cases superhardened with a proprietary technology by a company that treats jet turbine blades …—
Richard Nalley
Richard Nalleysuperhardened missile silos
Dictionary Entries Near superharden
Cite this Entry
“Superharden.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/superharden. Accessed 23 Apr. 2024.
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