Meaning of unio in English:

unio

Pronunciation /ˈjuːnɪəʊ/

noun

Zoology
  • In form Unio. The genus comprising the typical river mussels of the family Unionidae ; (also unio) a mussel belonging to this or a related genus, especially one yielding pearls; a river mussel, a pearl mussel.

Origin

Old English (in an earlier sense).