Definition of mystacial in English:

mystacial

(also mystachial)

Pronunciation /mɪˈsteɪʃl/ /mɪˈsteɪsɪəl/

adjective

Zoology
  • Relating to or situated on the upper lip; = moustachial .

Origin

Late 18th century. From ancient Greek μυστακ-, μύσταξ moustache + -ial.