Vireo solitarius

from WordNet (r) 3.0 (2006)

Vireo solitarius
    n 1: of eastern North America having a bluish-grey head and
         mostly green body [syn: {solitary vireo}, {Vireo
         solitarius}]

from The Collaborative International Dictionary of English v.0.48

Greenlet \Green"let\, n.
   1. (Zool.) One of numerous species of small American singing
      birds, of the genus {Vireo}, as the solitary, or
      blue-headed ({Vireo solitarius}); the brotherly-love ({V.
      Philadelphicus}); the warbling greenlet ({V. gilvus}); the
      yellow-throated greenlet ({V. flavifrons}) and others. See
      {Vireo}.
      [1913 Webster]

   2. (Zool,) Any species of {Cyclorhis}, a genus of tropical
      American birds allied to the tits.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Vireo \Vir"e*o\, n. [L., a species of bird.] (Zool.)
   Any one of numerous species of American singing birds
   belonging to {Vireo} and allied genera of the family
   {Vireonidae}. In many of the species the back is greenish, or
   olive-colored. Called also {greenlet}.
   [1913 Webster]

   Note: In the Eastern United States the most common species
         are the white-eyed vireo ({Vireo Noveboracensis}), the
         red-eyed vireo ({Vireo olivaceus}), the blue-headed, or
         solitary, vireo ({Vireo solitarius}), the warbling
         vireo ({Vireo gilvus}), and the yellow-throated vireo
         ({Vireo flavifrons}). All these are noted for the
         sweetness of their songs.
         [1913 Webster]