beluga Meaning, Definition & Usage

  1. noun valuable source of caviar and isinglass; found in Black and Caspian seas
    hausen; white sturgeon; Acipenser huso.
  2. noun small northern whale that is white when adult
    white whale; Delphinapterus leucas.

WordNet

Be*lu"ga noun
Etymology
Russ. bieluga a sort of large sturgeon, prop. white fish, fr. bieluii white.
Definitions
  1. (Zoöl.) 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