\ˈɛnza͡ɪm], \ˈɛnzaɪm], \ˈɛ_n_z_aɪ_m]\
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An organic substance of colloid structure, secreted by the body cells, which acts as a ferment, inducing chemical changes in other substances by catalysis, itself remaining apparently unchanged in the process. An effort has been made to introduce order in the nomenclature of the enzymes by calling each after the name of the body upon which it acts, adding the termination ase.
By Stedman, Thomas Lathrop
By Henderson, I. F.; Henderson, W. D.