The Collaborative International Dictionary of English v.0.48:

Baltimore bird \Bal"ti*more bird`\, Baltimore oriole
\Bal"ti*more o"ri*ole\ (Zool.)
   A common bird (Icterus galbula) of eastern and central
   America and Canada, named after Lord Baltimore, because its
   colors (black and orange red) are like those of his coat of
   arms; -- called also golden robin. It winters in the
   American tropics.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Baltimore oriole
    n 1: eastern subspecies of northern oriole [syn: Baltimore
         oriole, Baltimore bird, hangbird, firebird, Icterus
         galbula galbula]