rud·der·stock 
(rŭdər-stŏk′)
(rŭdər-stŏk′)n.
The vertical shaft of a rudder that allows it to pivot when the tiller or steering gear is operated. Also called rudderpost.
- cardinal flower
- cardinal number
- cardinal point
- cardinalship
- cardinal virtue
- cardio
- cardio-
- cardioacceleration
- cardioaccelerator
- cardiogenic
- cardiogram
- cardiograph
- cardiography
- cardioid
- cardiolipin
- cardiological
- cardiologist
- cardiology
- somniferous
- somniferously
- somnific
- somniloquist
- somniloquy
- somnolence
- somnolent