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Noun: insulator  'in-su,ley-tu(r) [N. Amer], 'in-syû,ley-tu(r) [Brit]
  1. A material such as glass or porcelain with negligible electrical or thermal conductivity
    "Ceramic insulators are commonly used on power lines";
    - dielectric, nonconductor

Derived forms: insulators

Type of: material, stuff

Encyclopedia: Insulator