tail fin

名词 tail fin:

1. a stabilizer that is part of the vertical tail structure of an airplane
   同义词：vertical stabilizer, vertical stabiliser, vertical fin, tailfin
2. one of a pair of decorations projecting above the rear fenders of an automobile
   同义词：tailfin, fin
3. the tail of fishes and some other aquatic vertebrates
   同义词：caudal fin

1. The fish's tail fin was hurt.
   这条鱼的尾鳍受伤了。