[ oil-hahr-dn ]
/ ˈɔɪlˌhɑr dn /
verb (used with object) Metallurgy.
to quench (steel) in a bath of oil.
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Origin of oil-harden
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019