insulator

Từ điển Oxford Advanced Learner 8th

in·su·la·tor [insulator insulators] BrE [ˈɪnsjuleɪtə(r)] NAmE [ˈɪnsəleɪtər] noun
a material or device used to prevent heat, electricity, or sound from escaping from sth

• Từ đồng nghĩa / Synonyms:
  dielectric, nonconductor