Source : Webster's Revised Unabridged Dictionary (1913)

Dugong \Du*gong"\, n. [Malayan d?y?ng, or Javan. duyung.]
   (Zo["o]l.)
   An aquatic herbivorous mammal ({Halicore dugong}), of the
   order Sirenia, allied to the manatee, but with a bilobed
   tail. It inhabits the Red Sea, Indian Ocean, East Indies, and
   Australia. [Written also {duyong}.]

Source : WordNet®

dugong
     n : sirenian tusked mammal found from eastern Africa to
         Australia; the flat tail is bilobate [syn: {Dugong dugon}]