What is the meaning of the Ancient Greek specific epithet *trochilus*?

Answer

Wren or small songbird

The specific epithet *trochilus* carries historical linguistic significance derived from Ancient Greek. Its established meaning relates to classifications of very small songbirds, frequently associated with the term for a 'wren.' This term was used before the species was standardized under its current scientific name, *Phylloscopus trochilus*. Interestingly, before its modern designation, the Willow Warbler was sometimes grouped with the Chiffchaff and Wood Warbler under the now obsolete common name, 'willow wren,' which echoes the meaning embedded in the specific epithet *trochilus*.

What is the meaning of the Ancient Greek specific epithet *trochilus*?
taxonomybirdclassificationsciencewarbler