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

Alternative form of hurden (“coarse linen”)

Third-person singular simple present indicative form of harden

plural of Harden

A surname.

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

(metallurgy) The process of imparting greater hardness to the surface of a piece of metal.

(metallurgy) Metal that is harder at its surface, due to a case hardening process.

simple past tense and past participle of case harden

present participle of case harden