#fin_keel__finkeel  a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability
  supertype:  #plate  a sheet of metal or wood or glass or plastic
  part of:  #keel
  subtype:  #centerboard__centreboard__drop_keel__sliding_keel__slidingkeel  a retractable fin keel used on sailboats to prevent drifting to leeward
     subtype:  #daggerboard  a removable centerboard on a small sailboat that can be lowered into the water to serve as a keel

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