1) Gyrostabiliser 2) Stabiliser 3) Stabilizer 1) Gyrostabiliser 
[n] - a stabilizer consisting of a heavy gyroscope that spins on a vertical axis
gyrostabilizer 1. A device for stabilizing a seagoing vessel by counteracting its rolling motion from side to side, consisting essentially of a rotating gyroscope weighing about one percent of the displacement of the vessel. 2. An instrument having a heavy gyroscope whose axis spins in a vertical plane to reduce the side-to-side rolling of a ship ...
gyrostabiliser noun a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane
a device for stabilizing a seagoing vessel by counteracting its rolling motion from side to side, consisting essentially of a rotating gyroscope weighing about 1 percent of the displacement of the vessel. Also called