flipper

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a shoe for swimming;
the paddle-like front is an aid in swimming (especially underwater)
• Syn:
fin
• Derivationally related forms:
fin (for: fin), flip
• Hypernyms:
shoe
2. the flat broad limb of aquatic animals specialized for swimming
• Derivationally related forms:
flip
• Hypernyms:
limb
• Part Holonyms:
aquatic vertebrate, aquatic mammal