Entry 1 sense Webster, 1913 Moldy /mōl'-dē/ · Mold·y · IPA /ˈmoʊldi/ 01 a. Overgrown with, or containing, mold; smelling of mold; as, moldy cheese or bread. 1. Overgrown with, or containing, mold; smelling of mold; as, moldy cheese or bread.