fin/fɪn; fɪn/ n1 thin flat projecting part of a fish, used for swimming and steering 鳍. =>illus at fish 见fish插图.2 thing shaped like this on eg an aircraft or a rocket that helps to keep it stable 鳍状物（如飞行器或火箭上的尾翅）. =>illus at aircraft 见aircraft插图.
牛津英汉双解词典