Hardening

Definition:

(p. pr. & vb. n.) of Harden
(n.) Making hard or harder.
(n.) That which hardens, as a material used for converting the surface of iron into steel.

Compare hardening with other words:

gardening vs. hardening

hardening vs. obduration

curing vs. hardening

hardening vs. steel

hardening vs. iron

hard vs. hardening

hardening vs. tempering

crucible vs. hardening