skeg

plural skegs

1. nauticalA fin-like structure to the rear of the keel of a vessel that supports the rudder and protects a propeller.
2. nauticalA similar construction on a boat that acts as a keel.
3. A fin that serves to stabilize a surfboard.
4. AustraliaslangA surfer; a person who leads a surfing lifestyle.
5. obsoleteA 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.

   1601, C[aius] Plinius Secundus [i.e., Pliny the Elder], “[Book II.]”, in Philemon Holland, transl., The Historie of the World. Commonly Called, The Naturall Historie of C. Plinius Secundus. […], (please specify |tome=1 or 2), London: […] Adam Islip, →OCLC

6. obsoleteA kind of oat.

   SKEGS. A kind of oat, sometimes cultivated as a crop in Nottinghamshire. It is the Avena stipiformis of Linnaeus.

   1842, Cuthbert William Johnson, The farmer's encyclopædia, and dictionary of rural affairs

7. Northern EnglandA look or glance.