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Webster 1913 Edition

Hardening

Hard′en-ing

,
Noun.
1.
Making hard or harder.
2.
That which hardens, as a material used for converting the surface of iron into steel.

Webster 1828 Edition

Hardening

H`ARDENING

,
ppr.
Making hard or more compact; making obdurate or unfeeling; confirming; becoming more hard.

H`ARDENING

,
Noun.
The giving a greater degree of hardness to bodies than they had before.

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