unio

1. Any one of numerous species of fresh-water mussels belonging to Unio and many allied genera.

2. 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.

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Here are some other words you could make with the letters unio

Top Words by points	Points	Word Game
ion	3	Scrabble

2 Letters	Scrabble® Points
in	2
no	2
nu	2
oi	2
on	2
un	2

3 Letters	Scrabble® Points
ion	3
uni	3