skeg

A fin-like structure to the rear of the keel of a vessel that supports the rudder and protects a propeller.

A similar construction on a boat that acts as a keel.

A fin that serves to stabilize a surfboard.

A surfer; a person who leads a surfing lifestyle.

A sort of wild plum (Prunus spinosa or Prunus domestica subsp. insititia (syn. Prunus institia)).

Some take them for Damascen plums, or rather for Bullois, Skegs, or such like wilde Plums.