Skeg
WordNet

noun


(1)   A brace that extends from the rear of the keel to support the rudderpost
WiktionaryText

Noun



  1. a fin-like structure to the rear of the keel of a vessel that supports the rudder and protects a propeller
  2. a similar construction on a boat that acts as a keel
  3. a fin that serves to stabilize a surfboard
 
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