1) Acipenser huso 2) Beluga 3) Sturgeon 4) White sturgeon 1) Beluga 
[crater] Hausen is a large lunar impact crater that lies along the south-southwestern limb of the Moon. The visibility of this crater is significantly affected by libration effects, although even under the best of conditions it is viewed nearly from on edge. It lies along the western edge of the immense walled plain Bailly. To the northeast...
• (n.) A large sturgeon (Acipenser huso) from the region of the Black Sea. It is sometimes twelve feet long.
large species of sturgeon (q.v.).[2 related articles]
Hau'sen (ha'sĕn) noun [ G.] (Zoology) A large sturgeon ( Acipenser huso ) from the region of the Black Sea. It is sometimes twelve feet long. 
white sturgeon 2 Acipenser huso noun valuable source of caviar and isinglass; found in Black and Caspian seas