Sclerosis (also sclerosus in the Latin names of a few disorders) is a hardening of tissue and other anatomical features. It may refer to: Sclerosis (medicine), a hardening of tissue in zoology, a process which forms sclerites, a hardened exoskeleton in botany, a process which hardens plant tissue by adding fibers and sclereids, resulting in sclerenchyma in economics, eurosclerosis.