histozyme

from The Century Dictionary.

• noun A substance or agent producing a zymotic action in the tissues.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Physiol. Chem.) A soluble enzyme occurring in the animal body, to the presence of which many normal decompositions and synthetical processes are supposed to be due.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry, dated A soluble ferment occurring in the animal body, supposed to be responsible for many normal decompositions and synthetic processes.