| proenzyme | (n) any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active, Syn. zymogen |
| proenzyme | n. [ . ] (Bioch.) Any one of a class of proteins that are converted, in the normal course of cellular metabolism, into one or more active enzymes; also called |