# insulator

/ˈɪnsəˌɫeɪtɝ/ (US) · /ˈɪnsuːlˌeɪtɐ/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/insulator
Updated: 2026-05-28

## Definition

a material that stops heat, electricity, or sound from moving through it. You use it to keep things warm or to protect you from electric shocks.

For teachers: a material that resists the flow of heat, electricity, or sound. Often used in the context of thermal or electrical safety.

## Examples

- Wool is a good insulator for keeping you warm.
- The electrician wore rubber gloves because rubber is an excellent insulator that prevents shocks.
- In high-voltage power lines, ceramic insulators are used to prevent the current from leaking into the surrounding air or the metal towers that support the cables.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.