Definition of "lightsaber"

[Obi-Wan Kenobi to Luke Skywalker] Your father's lightsaber. This is the weapon of a Jedi Knight. Not as clumsy or random as a blaster. An elegant weapon for a more civilized age.

1977 May 25, George Lucas, Star Wars, spoken by Obi-Wan Kenobi (Alec Guinness)

Wielding his flashlight like a lightsaber, Kyle sent golden shafts slicing through the swirling vapors.

2004, Rob N. Hood, Beyond the Wind, Binghamton, N.Y.: Southern Tier Editions/Harrington Park Press, page 1

This was the era of Star Wars, the reinvention of science fiction with the homely Luke Skywalker. But even Luke had the Force and a tie-fighter. The Doctor was a humanist, and his spacecraft was an obsolete phone box redolent of bobbies with whistles. He would never resort to lightsabre against villains, preferring to confront them with jelly babies.

2006 September, Steve Tomkins, “Icon of the Month No. 82: Dr Who”, in Simon Jones, editor, Third Way, volume 29, number 7, Harrow, London: Third Way Trust, page 24

Poster Power / Get the scheme behind the scene with Star Wars Blueprints: The Ultimate Collection. This boxed set includes five double-sided posters with blueprints of the Death Star, R2-D2, and C-3PO, lightsabers and blasters, Darth Vader and the Millennium Falcon.

2008 November, “Collecting”, in Boys' Life, volume XCVIII, number 11, Irving, Tx.: Boy Scouts of America, page 52