/ Dictionary / Index I inviscid: Meaning and Definition of Find definitions for: in•vis•cid Pronunciation: (in-vis'id), [key] — adj. (of a fluid) having no viscosity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. inviolate invisible 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