an Old World warbler, Phylloscopus trochilis, of Eurasian woodlands
willow warbler in American English
noun
any of several usually grayish-green leaf warblers, esp Phylloscopus trochilus, of Europe
Word origin
[1840–50]This word is first recorded in the period 1840–50. Other words that entered Englishat around the same time include: organizer, plaque, pylon, striation, warmup