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

 

stickleback

 noun
noun
BrE BrE//ˈstɪklbæk//
 
; NAmE NAmE//ˈstɪklbæk//
 
Fish
 
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a small freshwater fish with sharp points on its back See related entries: Fish Word Origin late Middle English: from Old English sticel ‘thorn, sting’ + bæc ‘back’.
See the Oxford Advanced American Dictionary entry: stickleback