dugongPronunciation: /ˈduːgɒŋ, ˈdjuː-/Definition of dugong noun (plural same or dugongs) a sea cow found on the coasts of the Indian Ocean from eastern Africa to northern Australia. It is distinguished from the manatees by its forked tail. Dugong dugon, family Dugongidae Origin: early 19th century: based on Malay duyongdugong in other Oxford dictionaries Definition of dugong in the US English dictionary