Be*lu"ga (?), n. [Russ. bieluga a sort of large sturgeon, prop. white fish, fr. bieluii white.] Zool.
A cetacean allied to the dolphins.
⇒ The northern beluga (Delphinapterus catodon) is the white whale and white fish of the whalers. It grows to be from twelve to eighteen feet long.
© Webster 1913.