noun

• (nautical) A fin-like structure to the rear of the keel of a vessel that supports the rudder and protects a propeller.
• (nautical) A similar construction on a boat that acts as a keel.
• A fin that serves to stabilize a surfboard.
• (Australia, slang) A surfer; a person who leads a surfing lifestyle.
• (obsolete) A sort of wild plum (Prunus spinosa or Prunus domestica subsp. insititia (syn. Prunus institia)).
• (obsolete) A kind of oat.
• (Northern England) A look or glance.