- The definition of a rudder is a moveable flat and wide piece of wood or metal used for steering or directing.
An example of a rudder is what helps an aircraft direct its course from left to right.
rudder definition by Webster's New World
- a broad, flat, movable piece of wood or metal hinged vertically at the stern of a boat or ship, used for steering
- a movable piece attached to the vertical stabilizer of an aircraft, etc., used for controlling direction to the left or right
- something serving to guide, direct, or control
Origin: Middle English rother ; from OE; akin to German ruder: see row
- rudderless adjective
rudder definition by American Heritage Dictionary
- a. A vertically hinged plate of metal, fiberglass, or wood mounted at the stern of a ship or boat for directing its course.b. A similar structure at the tail of an aircraft, used for effecting horizontal changes in course.
- A controlling agent or influence over direction; a guide.
Origin: Middle English ruder, from Old English rōther, steering oar; see erə- in Indo-European roots.