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

 

insulator

 noun
noun
BrE BrE//ˈɪnsjuleɪtə(r)//
 
; NAmE NAmE//ˈɪnsəleɪtər//
 
Electronics, Devices
 
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a material or device used to prevent heat, electricity, or sound from escaping from something See related entries: Electronics, Devices
See the Oxford Advanced American Dictionary entry: insulator