water-harden

[ waw-ter-hahr-dn, wot-er- ]
/ ˈwɔ tərˌhɑr dn, ˈwɒt ər- /

verb (used with object) Metallurgy.

to quench (steel) in water.
Compare oil-harden.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019