Something which deflects something else, especially a stream of fluid or particles. / A diaphragm in a lamp, stove, etc. by which the flame and gases are brought together to improve combustion.

plural of deflector

plural of smoke deflector

(rail transport) a device fitted to either side or on top of the smokebox of some steam locomotives, the purpose of which was to lift smoke clear of the locomotive at speed, so it wouldn't obscure the driver's vision.