'Vireo' definitions:

Definition of 'vireo'

From: WordNet
noun
Any of various small insectivorous American birds chiefly olive-grey in color

Definition of 'Vireo'

From: GCIDE
  • 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]