- A weapon that fires a beam or pulse of energy instead of a projectile.
- 1941 July, van Vogt, Alfred Elton, “The Seesaw”, in Astounding Science Fiction, volume 27, number 5, page 60:
- The window display was made up of an assortment of rather curiously shaped guns, rifles as well as small arms; and a glowing sign in the window stated: THE FINEST ENERGY WEAPONS IN THE KNOWN UNIVERSE.
- ray gun (informal)
- Jeff Prucher, editor (2007), “energy weapon”, in Brave New Words: The Oxford Dictionary of Science Fiction, Oxford, Oxfordshire; New York, N.Y.: Oxford University Press, →ISBN, page 51.