Definition of yellow wagtail in English:

yellow wagtail

noun

  • Either of two migratory Old World wagtails with olive-green upperparts and yellow underparts, Motacilla flava (more fully "western yellow wagtail") and M. tschutschensis (more fully "eastern yellow wagtail").

    M. tschutschensis was previously classified as a subspecies of M. flava.

Origin

Mid 17th century; earliest use found in John Wilkins (1614–1672), theologian and natural philosopher.