-breasted adj (in combination) 1. (Anatomy) having breasts of the size, shape, etc specified: full-breasted. 2. (Zoology) having plumage on the breast of the colour specified: red-breasted. Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014