/ Dictionary / Index I insulative: Meaning and Definition of Find definitions for: in•su•la•tive Pronunciation: (in'su-lā"tiv, ins'yu-), [key] — adj. serving to protect or insulate: glassware shipped in insulative packing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. insulation insulator 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