Pronunciation: (in'su-lā"tur, ins'yu-), [key]
a. a material of such low conductivity that the flow of current through it is negligible.
b. insulating material, often glass or porcelain, in a unit form designed so as to support a charged conductor and electrically isolate it.
2. a person or thing that insulates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.