Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

insulator

play
noun in·su·la·tor \ˈin(t)-sə-ˌlā-tər\

Simple Definition of insulator

  • : a material that allows little or no heat, electricity, or sound to go into or out of something

Source: Merriam-Webster's Learner's Dictionary

Full Definition of insulator

  1. :  one that insulates: as a :  a material that is a poor conductor (as of electricity or heat) — compare semiconductor b :  a device made of an electrical insulating material and used for separating or supporting conductors

Examples of insulator in a sentence

  1. Metal is not a good insulator.



1801

First Known Use of insulator

1801


INSULATOR Defined for Kids

insulator

play
noun in·su·la·tor \ˈin-sə-ˌlā-tər\

Definition of insulator for Students

  1. :  a material (as rubber or glass) that is a poor conductor of electricity, heat, or sound




Medical Dictionary

insulator

play
noun in·su·la·tor \ˈin(t)-sə-ˌlāt-ər\

Medical Definition of insulator

  1. :  a material that is used to provide insulation; also :  a device made of such material





Seen and Heard

What made you want to look up insulator? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

looking or feeling very sad

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

dog-eating-apple

Which is a synonym of asperse?

beat placate divulge defame
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ