Main Entry: vir·eo

Pronunciation: \ˈvir-ē-ˌō\

Function: noun

Inflected Form(s): plural vir·e·os

Etymology: Latin, a small bird, from virēre to be green

Date: 1834

: any of various small insectivorous American oscine birds (family Vireonidae, especially genus Vireo) that are chiefly olivaceous and grayish in color