/ Dictionary / Index I insulant: Meaning and Definition of Find definitions for: in•su•lant Pronunciation: (in'su-lunt, ins'yu-), [key] — n. an insulating material, as used in building trades. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: insulant (Thesaurus) insula insular Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language