flipper

n 1 broad flat limb of certain sea animals (not fish) used for swimming （非鱼类海生动物的）鳍状肢: Seals, turtles and penguins have flippers. 海豹、 海龟、 企鹅均有鳍状肢. 2 either of a pair of flat rubber attachments worn on the feet and used to help in underwater diving and swimming （用於潜水和游泳的）橡胶蹼, 鸭脚板.

flight sergeant, flight simulator, flight-deck, flight-recorder, flightless, flighty, flimsily, flimsiness, flimsy, flinch, fling, flint, flintlock, flinty, flip, flip side, flip-flop, flippancy, flippant, flippantly, flipping, flirt, flirtation, flirtatious, flit, float, floating, flock, floe, flog, flogging, flood, flood-tide, floodgate, flooding, floodlight, floor, floor show, floor-board, flooring,