John Chrysostom (?kr?s?st?m) n (Biography) Saint. ?345?407 ad, Greek bishop and theologian; one of the Fathers of the Greek Church, noted for his eloquence. Feast day: Sept 13Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014