deflector

noun3

1. •
   Something which deflects something else, especially a stream of fluid or particles.

   • The deflector assembly contains a plurality of vanes which change the direction of the solar energy to the vertical, while constantly keeping the same side of the deflector facing the sun. — 1992
2. •
   A diaphragm in a lamp, stove, etc. by which the flame and gases are brought together to improve combustion.
3. •
   A force field; an invisible barrier used as a protective shield.

   • The blasters are those beams of ravening destruction which take care of recalcitrant meteorites in a spaceship's course when the deflectors can't handle them. — 1945