reed warbler noun2 •A warbler, of the species Acrocephalus scirpaceus in the family Acrocephalidae, native to Eurasia and Africa.Familiar summer-morning bird song rises from the trees, reeds and bushes – song thrush, wren, reed bunting and the rhythmic, steady, repeated “chit-chit-chit” of a reed warbler. — 2016 •Any of various similar Old World birds of the same genus, especially great reed warbler (A. arundinaceus) and clamorous reed warbler (A. stentoreus). formsreed warblers