The Collaborative International Dictionary of English v.0.48:
Warbler \War"bler\, n.
1. One who, or that which, warbles; a singer; a songster; --
applied chiefly to birds.
In lulling strains the feathered warblers woo.
2. (Zool.) Any one of numerous species of small Old World
singing birds belonging to the family Sylviidae, many of
which are noted songsters. The bluethroat, blackcap, reed
warbler (see under Reed), and sedge warbler (see under
Sedge) are well-known species.
3. (Zool.) Any one of numerous species of small, often bright
colored, American singing birds of the family or subfamily
Mniotiltidae, or Sylvicolinae. They are allied to the
Old World warblers, but most of them are not particularly
Note: The American warblers are often divided, according to
their habits, into bush warblers, creeping warblers,
fly-catching warblers, ground warblers, wood warblers,
wormeating warblers, etc.
Bush warbler (Zool.) any American warbler of the genus
Opornis, as the Connecticut warbler (Opornis agilis).
Creeping warbler (Zool.), any one of several species of
very small American warblers belonging to Parula,
Mniotilta, and allied genera, as the blue yellow-backed
warbler (Parula Americana), and the black-and-white
creeper (Mniotilta varia).
Fly-catching warbler (Zool.), any one of several species of
warblers belonging to Setophaga, Sylvania, and allied
genera having the bill hooked and notched at the tip, with
strong rictal bristles at the base, as the hooded warbler
(Sylvania mitrata), the black-capped warbler (Sylvania
pusilla), the Canadian warbler (Sylvania Canadensis),
and the American redstart (see Redstart).
Ground warbler (Zool.), any American warbler of the genus
Geothlypis, as the mourning ground warbler (Geothlypis
Philadelphia), and the Maryland yellowthroat (see
Wood warbler (Zool.), any one of numerous American warblers
of the genus Dendroica. Among the most common wood
warblers in the Eastern States are the yellowbird, or
yellow warbler (see under Yellow), the black-throated
green warbler (Dendroica virens), the yellow-rumped
warbler (Dendroica coronata), the blackpoll (Dendroica
striata), the bay-breasted warbler (Dendroica
castanea), the chestnut-sided warbler (Dendroica
Pennsylvanica), the Cape May warbler (Dendroica
tigrina), the prairie warbler (see under Prairie), and
the pine warbler (Dendroica pinus). See also Magnolia
warbler, under Magnolia, and Blackburnian warbler.