'Sternpost' definitions:

Definition of 'sternpost'

(from WordNet)
noun
(nautical) the principal upright timber at the stern of a vessel

Definition of 'Sternpost'

From: GCIDE
  • Sternpost \Stern"post`\, n. (Naut.) A straight piece of timber, or an iron bar or beam, erected on the extremity of the keel to support the rudder, and receive the ends of the planks or plates of the vessel. [1913 Webster]