plural of hardener

present participle of harden

The process by which something hardens. / That which hardens, such as a material used for converting the surface of iron into steel.

Third-person singular simple present indicative form of harden

(intransitive) To become hard (tough, resistant to pressure). / (transitive, ergative) To make something hard or harder (tough, resistant to pressure). / (transitive, figuratively) To strengthen.

(metallurgy) The repeated plastic deformation of a material, causing a permanent distortion of its crystal structure, and an increase in its strength

to cold-hammer

(literally and figuratively) Unfeeling or lacking emotion due to experience in battle; callous.

Alternative spelling of case hardening

Alternative spelling of case hardened / Hardened by experience.