zyme (za?m) n1. (Biochemistry) biochem another name for ferment12. (Medicine) med obsolete something causing an infectious or zymotic diseaseCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014