Webster's Revised Unabridged Dictionary · 1913

Hardening

Hardening , noun

1.

Making hard or harder.

2.

That which hardens, as a material used for converting the surface of iron into steel.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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