in·su·la·tor 
(ĭnsə-lā′tər, ĭnsyə-)
(ĭnsə-lā′tər, ĭnsyə-)n.
1. A material that insulates, especially a nonconductor of sound, heat, or electricity.
2. A device that insulates.
- heterophony
- heterophyllous
- heterophylly
- heteroplastic
- heteroplasty
- heteroploid
- heteroploidy
- heteropteran
- heteropterous
- heterosexism
- heterosexist
- heterosexual
- heterosexuality
- heterosis
- heterosporous
- heterospory
- heterostyled
- heterostylous
- heterostyly
- heterotaxia
- heterotaxic
- heterotaxy
- heterothallic
- heterothallism
- heterotic