動詞 fin:

1. equip (a car) with fins
   同義詞：fin
2. propel oneself through the water in a finning motion
   同義詞：fin
3. show the fins above the water while swimming
   同義詞：fin, break water

1. The shark's fin sliced the water.
   鯊魚的背鰭像刀樣迅速劃破水面。
2. The fish's tail fin was hurt.
   這條魚的尾鰭受傷了。
3. The shark's dorsal fin was cut off by the fisherman.
   鯊魚的背鰭被漁夫割了下來。

finned

adj.（形容詞）
Having a fin, fins, or finlike parts. Often used in combination:
有鰭的：有鰭或鰭狀的。常用于復合詞中：
例句：
single-finned; multifinned.
單鰭的；多鰭的