a flat body part like an arm without fingers that some sea animals such as seals and turtles use for swimming (海豹、海龟等的)鳍肢,鳍足 Topics Animalsc2a long flat piece of rubber or plastic that you wear on your foot to help you swim more quickly, especially below the surface of the water (潜水、游泳用的)脚蹼,蛙鞋,鸭脚板,橡皮脚掌 a pair of flippers 一双脚蹼