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
It’s made from durable Canadian hemlock wood that not only looks good but also functions as an insulator.
—
Clara McMahon, PEOPLE, 6 Nov. 2025
The team’s success in identifying the polaron not only explains the material’s strange switch from metal to insulator but also confirms a key theoretical concept in a new class of materials.
—Aman Tripathi, Interesting Engineering, 2 Nov. 2025
To observe the quantum mechanical motion of this macroscopic phase variable, the three scientists fabricated a device called the Josephson junction, which consists of two pieces of superconductors separated by an insulator layer thinner than 1/10,000 of a human hair.
—Zhixin Wang, The Conversation, 10 Oct. 2025
But in the quantum world, matter takes on other forms – superconductors, magnets, topological insulators and, potentially, a slew of other states that non-quantum scientists haven’t even contemplated.
—Andre Mouchard, Oc Register, 28 Sep. 2025
See All Example Sentences for insulator
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Clara McMahon, PEOPLE, 6 Nov. 2025
The team’s success in identifying the polaron not only explains the material’s strange switch from metal to insulator but also confirms a key theoretical concept in a new class of materials.
—Aman Tripathi, Interesting Engineering, 2 Nov. 2025
To observe the quantum mechanical motion of this macroscopic phase variable, the three scientists fabricated a device called the Josephson junction, which consists of two pieces of superconductors separated by an insulator layer thinner than 1/10,000 of a human hair.
—Zhixin Wang, The Conversation, 10 Oct. 2025
But in the quantum world, matter takes on other forms – superconductors, magnets, topological insulators and, potentially, a slew of other states that non-quantum scientists haven’t even contemplated.
—Andre Mouchard, Oc Register, 28 Sep. 2025
See All Example Sentences for insulator
Cite this Entry
“Insulator.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/insulator. Accessed 8 Nov. 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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