rudderpost

noun
rud·​der·​post | \ˈrə-dər-ˌpōst \

Definition of rudderpost 

1 : the shaft of a rudder

2 : an additional sternpost in a ship with a single screw propeller to which the rudder is attached

First Known Use of rudderpost

1691, in the meaning defined at sense 1

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The first known use of rudderpost was in 1691

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