deflector

1. (science fiction) A force field; an invisible barrier used as a protective shield.Examples: "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."; "Deflectors say there's something there, sensors say there isn't. Density negative. Radiation negative. Energy negative."; "PICARD: If the Romulans have returned to this sector we should know about that. Mister Worf, any further activity? WORF: Negative, sir. PICARD: Slow to half impulse. LAFORGE: Going to one half impulse. ... Now entering quadrant nine-zero-seven, mark three. PICARD: Shields and deflectors up. Go to Yellow Alert."