sea cow

noun
1.
any sirenian, as the manatee or dugong.
2.
Obsolete. the hippopotamus.

Origin:
1605–15

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World English Dictionary
sea cow
 
n
1.  any sirenian mammal, such as a dugong or manatee
2.  an archaic name for walrus

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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