sea cow

any sirenian, as the manatee or dugong.
Obsolete. the hippopotamus.

1605–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sea cow
1.  any sirenian mammal, such as a dugong or manatee
2.  an archaic name for walrus

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The closest relative to the elephants are the relatives of the sea cow.
Certain human activities are also the main problem facing the endangered manatee, or sea cow.
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