- 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.
Origin of insulator
Examples from the Web for insulator
Historical Examples of insulator
Each one that will not make it ring is a poor conductor or an insulator.Common Science
Carleton W. Washburne
It must therefore be considered rather as a partial conductor than as an insulator.On Laboratory Arts
The action of its particles differs from those of an insulator only in degree.Faraday As A Discoverer
The wood is used for posts, cross-ties, wagon hubs, and insulator pins.Studies of Trees
Jacob Joshua Levison
Speaking generally, the conductors are separated by some insulator.Cyclopedia of Telephony & Telegraphy Vol. 1
1801, agent noun in Latin form from insulate.