device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"

fin - a stabilizer that resembles the fins of a fish

gyrostabiliser, gyrostabilizer - a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane

outrigger - a stabilizer for a canoe; spars attach to a shaped log or pontoon parallel to the hull

anti-sway bar, stabilizer bar - a rigid metal bar between the front suspensions and between the rear suspensions of cars and trucks; serves to stabilize the chassis