Definition of musion in US English:

musion

noun

Heraldry
historical
  • The wild or domestic cat, as a heraldic charge.

Origin

Late 16th century; earliest use found in John Bossewell (d. 1580), author. From post-classical Latin musion-, musio cat from classical Latin mūs + -iō.

Pronunciation

musion

/ˈmjuːsɪɒn/