n.

1. A material that insulates, especially a nonconductor of sound, heat, or electricity.
2. A device that insulates.

insulator

A material that does not easily transmit energy, such as electric current or heat. Materials such as wood, plastic, and ceramics are insulators. Fiberglass is an example of a heat insulator. (Compare conductor.)

A material that does not conduct electricity. Contrast with conductor.

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For more information on insulator, visit Britannica.com.

A component or device made from material having great enough resistance to the flow of electric current to be effectively considered as a nonconductor of current.

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IN BRIEF: Anything that slows or stops the flow of electricity, heat, or sound.

It is amazing that shredded paper makes a good insulator against the cold.

Dansk (Danish)
n. - isolator, isolerbånd

Nederlands (Dutch)
isolator, isolatie(middel)

Français (French)
n. - (Élec, Constr) isolant, isolateur

Deutsch (German)
n. - Isolator

Ελληνική (Greek)
n. - (ηλεκτρ.) μονωτήρας (αγωγού)

Italiano (Italian)
isolante

Português (Portuguese)
n. - isolador (m) (Eletr.)

Русский (Russian)
изолятор, диэлектрик

Español (Spanish)
n. - aislante, aislador

Svenska (Swedish)
n. - isolator (fys. el. tekn.)

中文（简体） (Chinese (Simplified))
绝缘体, 绝热器

中文（繁體） (Chinese (Traditional))
n. - 絕緣體, 絕熱器

한국어 (Korean)
n. - 격리자, 절연체, 뚱딴지

日本語 (Japanese)
n. - 絶縁体, 絶縁器, 碍子

العربيه (Arabic)
‏(الاسم) العازل ( وبخاصه الكهربائي)‏

עברית (Hebrew)
n. - ‮מבדד‬

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