Definition of moustachial in English:

moustachial

(also mustachial)

adjective

Ornithology
  • Resembling a moustache; specifically designating a streak of colour running back from the sides of a bird's beak.

Origin

Late 19th century; earliest use found in Edward Blyth (1810–1873), zoologist. From moustache + -ial.

Pronunciation

moustachial

/məˈstɑːʃɪəl/