Source : Webster's Revised Unabridged Dictionary (1913)

Greenlet \Green"let\, n.
   l. (Zo["o]l.) 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}.

   2. (Zo["o]l,) Any species of {Cyclorhis}, a genus of tropical
      American birds allied to the tits.

Source : WordNet®

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