insulator
noun
in·su·la·tor
ˈin(t)-sə-ˌlā-tər 
: one that insulates: such 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
Metal is not a good insulator.
Recent Examples on the Web
The Cornell group, however, started with an insulator and added nothing.
—
Charlie Wood, WIRED, 12 Jan. 2025
The other material, however, always remains an insulator.
—Manon Bischoff, Scientific American, 1 May 2023
There’s no arguing that wool is a better insulator from the cold.
—Joe Jackson, Outside Online, 9 Jan. 2025
Fortunately, most plants won't suffer from a light layer of snow, which serves as a natural insulator and can actually protect plants from harsh winds and bracing cold.
—Brandee Gruener, Southern Living, 6 Jan. 2025
See all Example Sentences for insulator 
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Charlie Wood, WIRED, 12 Jan. 2025
The other material, however, always remains an insulator.
—Manon Bischoff, Scientific American, 1 May 2023
There’s no arguing that wool is a better insulator from the cold.
—Joe Jackson, Outside Online, 9 Jan. 2025
Fortunately, most plants won't suffer from a light layer of snow, which serves as a natural insulator and can actually protect plants from harsh winds and bracing cold.
—Brandee Gruener, Southern Living, 6 Jan. 2025
See all Example Sentences for insulator
Dictionary Entries Near insulator
Cite this Entry
“Insulator.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/insulator. Accessed 2 Feb. 2025.
Copy CitationKids Definition
insulator
noun
in·su·la·tor
ˈin(t)-sə-ˌlāt-ər
: one that insulates
especially
: a material that is a poor conductor of heat or electricity or a device made of such material
Medical Definition
insulator
noun
in·su·la·tor
ˈin(t)-sə-ˌlāt-ər
: a material that is used to provide insulation
also
: a device made of such material
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