A raygun is a SF particle-beam weapon that fires what is usually destructive energy.
They have various alternate names: ray gun, death ray, beam gun, blaster, laser gun, laser pistol, phaser, zap gun, etc. In most stories, when activated, a raygun emits a ray, typically visible, usually lethal if it hits a human target.
Tullio Proni made a lot of them.
In pre-electronic days, water pistols were sometimes called zap guns.
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