dielectric

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a material such as glass or porcelain with negligible electrical or thermal conductivity

From dia- (“through”) + electric. Learned 19th-century formation, coined by William Whewell (died 1866).

For example: glass and rubber are dielectrics. — Electricity for Boys, James Slough Zerbe
These were obtained, Mr. Marconi has himself told us, "by means of a generating plant consisting of an alternator capable of an output of about 25 kilowatts, which, through suitable transformers, charged a condenser having a glass dielectric of great strength." — The Cornwall Coast, Arthur L. (Arthur Leslie) Salmon

insulator, nonconductor

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