STERNPOST
sternpost
(noun) (nautical) the principal upright timber at the stern of a vessel
Source: WordNet® 3.1
Etymology
Noun
sternpost (plural sternposts)
(nautical) A timber or steel bar extending from the keel to the main deck at the stern of a vessel.
Source: Wiktionary
Stern"post`, n. (Naut.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition