dielectric

noun

di·​elec·​tric ˌdī-ə-ˈlek-trik How to pronounce dielectric (audio)
: a nonconductor of direct electric current
dielectric adjective

Examples of dielectric in a Sentence

Recent Examples on the Web
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For instance, the middle layer conducting ions sits below the evaporating layer on top, while sitting above a dielectric (a substance that poorly conducts electricity but effectively stores it) array of silicon nanopillars. New Atlas, 26 Apr. 2026 Another reason customers are not in-housing is that the complexity of liquid cooling – managing technical challenges such as fluid dynamics, leak prevention, and dielectric fluids -- is much higher than air cooling. Peter Cohan, Forbes.com, 13 Feb. 2026 In that role, engineers often call them dielectrics. Mahesh Nepal, The Conversation, 19 Jan. 2026 As for the waveguide, it’s made of a dielectric at the center, which channels the terahertz signal, surrounded by cladding. IEEE Spectrum, 27 Dec. 2025

Word History

Etymology

dia- + electric

First Known Use

1837, in the meaning defined above

Time Traveler
The first known use of dielectric was in 1837

Browse Nearby Words

Cite this Entry

“Dielectric.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dielectric. Accessed 20 May. 2026.

Medical Definition

dielectric

noun
di·​elec·​tric ˌdī-i-ˈlek-trik How to pronounce dielectric (audio)
: a nonconductor of direct electric current
dielectric adjective

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