Ū'ni-ō, n.
n. [N. Lat., from Lat. unio, unity, union, a single large pearl. See infra.] (Conch.) A genus of fresh-water bivalves, allied to the muscles, though commonly called fresh-water clams. Dana.
n. [N. Lat., from Lat. unio, unity, union, a single large pearl. See infra.] (Conch.) A genus of fresh-water bivalves, allied to the muscles, though commonly called fresh-water clams. Dana.