Skegs

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.
4. A surfer; a person who leads a surfing lifestyle.
5. A sort of wild plum (Prunus spinosa or Prunus domestica subsp. insititia (syn. Prunus institia)).