Vir·e·o n.  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.
 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.
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 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.
 2. Zool, Any species of Cyclorhis, a genus of tropical American birds allied to the tits.
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 Vireo solitarius
      n : of eastern North America having a bluish-gray head and
          mostly green body [syn: solitary vireo]