war·bler / ˈwôrb(ə)lər/ • n. 1. any of a number of small insectivorous songbirds that typically have a warbling song, in particular: ∎  a New World bird (subfamily Parulinae) of the bunting family. ∎  an Old World bird of the family Sylviidae, which includes the blackcap, whitethroat, and chiffchaff. 2. inf. a person who sings in a trilling or quavering voice.

warbler Numerous birds of two families, one in the Old World (Sylviidae) and the other in the New World (Parulidae). Old World warblers include the hedge sparrow and tailorbird. Most New World warblers have brighter plumage.