脊鳍，汉语词汇，指鱼类的背鳍。
n. dorsal fin
它的脊鳍朝下耷拉着，巨大的胸鳍大张着。
His dorsal fin was down and his huge pectorals were spread wide.
一种产于北美的小型淡水鱼（鰤鲈） ，长有带斑点的刺状脊鳍。
A small North American freshwater fish (Stizostidion canadense) having a spotted, spiny dorsal fin.
它闻到了这新鲜的血腥气，此刻正加快了速度，蓝色的脊鳍划破了水面。
Now he speeded up as he smelled the fresher scent and his blue dorsal fin cut the water.
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