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See more synonyms for oil-harden on Thesaurus.com
verb (used with object) Metallurgy.
  1. to quench (steel) in a bath of oil.
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Compare water-harden.

Origin of oil-harden

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for oil hardening

oil hardening

  1. a process of hardening high-carbon or alloy steels by heating and cooling in oilCompare air hardening
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012