- a material of such low conductivity that the flow of current through it is negligible.
- insulating material, often glass or porcelain, in a unit form designed so as to support a charged conductor and electrically isolate it.
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OTHER WORDS FROM insulatornon·in·su·la·tor, noun
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How to use insulator in a sentence
Wool not only makes for great performance wear, but it’s also the ideal camper insulator for its ability to retain warmth, reduce energy loss and noise, and resist mold and mildew.
It’s very light, can absorb immense heat, and is an effective insulator.‘7 Minutes of Terror’: The Technology Perseverance Will Need to Survive Landing on Mars|Chris James|February 18, 2021|Singularity Hub
The problems include cracked insulators that shield the electrified third rail, malfunctioning fans and noncompliant snow melters, according to a Metro report to the board.Metro board moves ‘doomsday’ budget forward to accept public comments|Justin George|December 11, 2020|Washington Post
With its low density, air is an ideal insulator, which is why puffy coats work so well.Want to Get Outside All Winter? Bring Your Thermos.|AC Shilton|November 29, 2020|Outside Online
The general idea is that the light pulses redistribute electrons among the energy bands in a way that tips the balance between one phase of the system and another — between a metal and an insulator, say.
The sheath surrounding the nerves acts as an electrical insulator, increasing neural speed by 100-fold.
It was more than a question of finding the perfect electrical insulator, though that would be handy too.Security|Poul William Anderson
A wire was led through an insulator, so that the stream of electricity could be subjected to experiment in the Hut.The Home of the Blizzard|Douglas Mawson
The insulators are of glass, protected by a wooden shield, of the pattern known as the Wade insulator.
For the insulation of the wires he recommended gutta-percha, which was then becoming known as an insulator.
In 1854 he introduced the pneumatic dispatch into London, and, in 1856, he patented his well-known double-cup insulator.
British Dictionary definitions for insulator
Scientific definitions for insulator
Cultural definitions for insulator
A material that does not easily transmit energy, such as electric current (see also current) or heat. Materials such as wood, plastic, and ceramics are insulators. Fiberglass is an example of a heat insulator. (Compare conductor.)