/ Dictionary / Index I insulator: Meaning and Definition of Find definitions for: in•su•la•tor Pronunciation: (in'su-lā"tur, ins'yu-), [key] — n. 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. a person or thing that insulates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: insulator (Thesaurus) insulative insulin Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language