aquatic mammal

Từ điển WordNet v3.1 - WordNet Dictionary

noun

whales and dolphins;
manatees and dugongs;
walruses;
seals
• Hypernyms:
placental, placental mammal, eutherian, eutherian mammal
• Hyponyms:
cetacean, cetacean mammal, blower, sea cow, sirenian mammal,
sirenian, pinniped mammal, pinniped, pinnatiped
• Part Meronyms:
flipper