sclerotization

This term is a highly specialized technical word used almost exclusively in entomology and zoology. It describes the chemical transformation of a soft cuticle into a rigid exoskeleton, a process essential for the survival of arthropods during molting.

Because it refers to a specific biochemical process, it is treated as an uncountable noun. It is not used in casual conversation or general medical contexts unless referring specifically to the hardening of tissues in a way that mimics the arthropod process.