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Webster 1913 Edition

Hardener

Hard′en-er

(-’n-ẽr)

,

Noun.

One who, or that which, hardens; specif., one who tempers tools.

Webster 1828 Edition

Hardener

H`ARDENER

,

Noun.

He or that which makes hard, or more firm and compact.

Definition 2024

hardener

hardener

English

Noun

hardener ‎(plural hardeners)

One who, or that which, hardens.
the hardener of hearts
A chemical substance added to something in order to harden it; used especially with paints, varnishes and resins.