CATHEPSIN Meaning of CATHEPSIN in English [ca.thep.sin] n [Gk kathepsein to digest (fr. kata- cata- + hepsein to boil) + E [2]-in] (1929): any of several intracellular proteases of animal tissue that aid in autolysis Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012