noun (n)

• a material such as glass or porcelain with negligible electrical or thermal conductivity

  bahan seperti kaca atau porselin dengan sedikit sahaja listrik atau terma perihal pengaliran elektrik

  Synonym:
  dielectric, nonconductor
  Antonym:
  conductor
  

  source: wordnet30
• One who, or that which, insulates.

  satu yang, atau itu yang, insulates.

  source: webster1913