Abnormal hardening or thickening of tissue

The process of becoming hard or solid by cooling or drying or crystallization

The act of making something harder (firmer or tighter or more compact)

Precipitation hardening, also called age hardening or particle hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels, stainless steels, and duplex stainless steel.

Cold hardening is the physiological and biochemical process by which an organism prepares for cold weather.

In computer security, hardening is usually the process of securing a system by reducing its surface of vulnerability, which is larger when a system performs more functions; in principle a single-function system is more secure than a multipurpose one.

التصلب في علم النبات هو عملية بموجبها يصبح النبات قادرًا على تحمل تأثيرات التجمد طوال عدة أسابيع أو أشهر.