Insulator

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Insulator \In"su*la`tor\, n.
     1. One who, or that which, insulates.
        [1913 Webster]
  
     2. (Elec. & Thermotics) A substance or object that insulates;
        a nonconductor; as, polyurethane foam is a popular thermal


        insulator.
        [1913 Webster +PJC]

From WordNet (r) 2.0 [wn]:

  insulator
       n : a material such as glass or porcelain with negligible
           electrical or thermal conductivity [syn: {dielectric}, {nonconductor}]
           [ant: {conductor}]