ray gun

noun
1.
a gun that can fire bursts of usually destructive or lethal rays: a science fiction novel whose hero has a ray gun made of gold.
2.
a child's futuristic toy gun that emits sparks, whirring noises, etc.

Origin:
1930–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ray gun
 
n
(in science fiction) a gun that emits rays to paralyse, stun, or destroy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
There's no doubt this oversized ray gun can deliver the heat.
It's the ultimate fish out of water story, except the fish knows how to fight
  and has a sword and ray gun.
His largest and best measured four feet in length, with a headlight-sized
  mirror and the zany appearance of a ray gun.
If some deviant wished to produce a real ray gun, this might be an opportunity.
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