a thin flat part that sticks out from the body of a fish, used for swimming and keeping balance (鱼的)鳍 Topics Fish and shellfishc1a thin flat part that sticks out from the body of a vehicle, an aircraft, etc., used for improving its balance and movement 鳍状物,翼(车辆、航空器等用以保持平衡等的突出窄扁部分) tail fins 垂直尾翼
Word OriginOld English finn, fin, of Germanic origin; related to Dutch vin and probably ultimately to Latin pinna ‘feather, wing’.