Definition of speargun noun from the Oxford Advanced Learner's Dictionary

 

speargun

 noun
noun
BrE BrE//ˈspɪəɡʌn//
 
; NAmE NAmE//ˈspɪrɡʌn//
 
 
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a gun which shoots spears (= long, pointed pieces of metal) and is used underwater
See the Oxford Advanced American Dictionary entry: speargun