any of a genus (Dugong) of large tropical sirenian mammals that live along the shores of the Indian Ocean and feed mostly on seaweed
Origin:
ModL < Malay duyong
See dugong in American Heritage Dictionary 4
noun
A herbivorous marine mammal (Dugong dugon), native to tropical coastal waters of the Indian Ocean, Red Sea, and southwest Pacific Ocean and having flipperlike forelimbs and a deeply notched tail fin.