stabilizer

noun7

1. •
   Any person or thing that brings stability.
2. •
   Any substance added to something in order to stabilize it, as for example a fuel additive that prolongs the shelf life of petrol.
3. •
   An additional wheel on a bicycle to keep it upright to assist a learner.
4. •
   A gyroscopically controlled fin or similar device that prevents the excess rolling of a ship in rough seas.
5. •
   An airfoil that stabilizes the flight of an aircraft or missile.
6. •
   A piece of backing fabric used in embroidery.
7. •
   For a group operating on a set and an element x of the set, the set of all group elements fixing x.