1 a flat arm that is part of the body of some sea animals which they use for swimming （某些海洋动物的）鳍足，鳍状肢: Seals have flippers. 海豹长着鳍足。 ☞picture at seal 见seal插图

2 a rubber shoe shaped like an animal's flipper that people wear so that they can swim better, especially under water （潜水用的）脚蹼: a pair of flippers 一双脚蹼 ☞picture at dive 见dive插图