/ Dictionary / Index I instar: Meaning and Definition of Find definitions for: in•star Pronunciation: (in'stär), [key] — n. an insect in any one of its periods of postembryonic growth between molts. in•star Pronunciation: (in-stär'), [key] — -starred, -star•ring. to set with or as if with stars. to place as a star. to make a star of. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: instar (Thesaurus) instant replay instate 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