be·lu·ga /bəˈlugə/
  白色大尋魚白鯨
  Be·lu·ga n.
  1. Zool. A cetacean allied to the dolphins.
  Note: ☞ 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.
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  beluga
       n 1: valuable source of caviar and isinglass; found in Black and
            Caspian seas [syn: hausen, white sturgeon, Acipenser
            huso]
       2: small northern whale that is white when adult [syn: white
          whale, Delphinapterus leucas]