-rel suffix forming nouns mainly disparaging indicating a person or thing viewed as diminutive, trivial, or worthless: mongrel; wastrel. Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014-rel or -erel a noun suffix having diminutive or pejorative force: wastrel. [Middle English