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

 

hatpin

 noun
noun
BrE BrE//ˈhætpɪn//
 
; NAmE NAmE//ˈhætpɪn//
 
Hair products and accessories
 
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a long pin used for fastening a hat to your hair, especially in the past See related entries: Hair products and accessories
See the Oxford Advanced American Dictionary entry: hatpin