Source : Webster's Revised Unabridged Dictionary (1913)

Hausen \Hau"sen\, n. [G.] (Zo["o]l.)
   A large sturgeon ({Acipenser huso}) from the region of the
   Black Sea. It is sometimes twelve feet long.

Source : WordNet®

hausen
     n : valuable source of caviar and isinglass; found in Black and
         Caspian seas [syn: {beluga}, {white sturgeon}, {Acipenser
         huso}]