Usually means: Material that resists electrical current flow.
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We found 42 dictionaries that define the word insulator:

General (25 matching dictionaries)
  1. insulator: Merriam-Webster
  2. insulator: Oxford Learner's Dictionaries
  3. insulator: American Heritage Dictionary of the English Language
  4. insulator: Collins English Dictionary
  5. insulator: Vocabulary.com
  6. Insulator, insulator: Wordnik
  7. insulator: Cambridge Advanced Learner's Dictionary
  8. insulator: Wiktionary
  9. insulator: Webster's New World College Dictionary, 4th Ed.
  10. insulator: The Wordsmyth English Dictionary-Thesaurus
  11. insulator: Infoplease Dictionary
  12. insulator: Dictionary.com
  13. Insulator (electrical), Insulator (electricity), Insulator (genetics), Insulator: Wikipedia, the Free Encyclopedia
  14. Insulator: Online Plain Text English Dictionary
  15. insulator: Webster's Revised Unabridged, 1913 Edition
  16. insulator: Rhymezone
  17. Insulator: AllWords.com Multi-Lingual Dictionary
  18. insulator: Webster's 1828 Dictionary
  19. insulator: Stammtisch Beau Fleuve Acronyms
  20. insulator: FreeDictionary.org
  21. insulator: Mnemonic Dictionary
  22. insulator: TheFreeDictionary.com
  23. insulator: Longman Dictionary of Contemporary English

Business (3 matching dictionaries)
  1. Construction Term Glossary (No longer online)
  2. Insulator: Energy Dictionary
  3. insulator: Legal dictionary

Computing (3 matching dictionaries)
  1. insulator: CCI Computer
  2. insulator: Computer Telephony & Electronics Dictionary and Glossary
  3. Insulator (power engineering), insulator: Encyclopedia

Medicine (2 matching dictionaries)
  1. insulator: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)

Science (3 matching dictionaries)
  1. Electrochemistry Dictionary (No longer online)
  2. Chemistry Dictionary (No longer online)
  3. Insulator: Eric Weisstein's World of Physics

Slang (1 matching dictionary)
  1. insulator: Urban Dictionary

Tech (5 matching dictionaries)
  1. insulator: Webster's New World Telecom Dictionary
  2. AUTOMOTIVE TERMS (No longer online)
  3. Glossary of Energy Terms (No longer online)
  4. Sweetwater Music (No longer online)
  5. INSULATOR: Power Engineering

(Note: See insulators as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator).
noun:  A non-conductive structure, coating or device that does not transmit sound, heat or electricity (see image)
noun:  A person who installs insulation.

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