from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various proteolytic enzymes found in animal tissue that catalyze the hydrolysis of proteins into polypeptides.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a family of proteases primarily active within lysosomes.
German Kathepsin, from Greek kathepsein, to digest : kat-, kata-, cata- + hepsein, to boil.(American Heritage® Dictionary of the English Language, Fourth Edition)
From the German Kathepsin, derived from Ancient Greek καθέψω (kathépsō, "boil down"). (Wiktionary)