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Search Result for "insulator": 
Wordnet 3.0

NOUN (1)

1. a material such as glass or porcelain with negligible electrical or thermal conductivity;
[syn: insulator, dielectric, nonconductor]

The Collaborative International Dictionary of English v.0.48:

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]