- a finlike projection extending downward from the keel of a sailboat, serving to prevent lateral motion and acting as additional ballast.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for fin keel
The fin-keel requires great depth if it is to be of any real use, and it is in this particular point that small yachts suffer.Yachting Vol. 1
As to whether a fin-keel or a weighted centreboard is the better, he has not yet made up his mind.Yachting Vol. 2
The shark-bodied cutter, with her fin-keel below and her balloon above, was indeed now moving toward a position above the cruiser.
- a projection from the keel of a vessel to give it additional stability