or rud·der post
the vertical member of a stern frame on which the rudder is hung; a sternpost.
Origin of rudderpost
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Also called: rudderstock (ˈrʌdəˌstɒk) a postlike member at the forward edge of a rudder
the part of the stern frame of a vessel to which a rudder is fitted
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012