Development of excess fibrous connective tissue in an organ WordNet 3.0 & Open English WordNet

Fibrosis, also known as fibrotic scarring, is a pathological wound healing in which connective tissue replaces normal parenchymal tissue to the extent that it goes unchecked, leading to considerable tissue remodelling and the formation of permanent scar tissue. Wikipedia

Formation of excess fibrous connective tissue in an organ or tissue in a reparative or reactive process Wikidata

The formation of (excess) fibrous connective tissue in an organ. Wiktionary

Formation of connective tissue. Wiktionary (translation)