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Definition of ray gun noun from the Oxford Advanced Learner's Dictionary

ray gun

noun
 
/ˈreɪ ɡʌn/
 
/ˈreɪ ɡʌn/
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  1. (in science fiction stories) a gun that kills or injures people by sending out harmful rays
See ray gun in the Oxford Advanced American Dictionary
efficacy
noun
 
 
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