/ Dictionary / Index N niobic acid: Meaning and Definition of Find definitions for: nio'bic ac'id Pronunciation: [key] — Chem. Chem. a white, water-insoluble solid, NbO&multiplydot;nHO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. niobic Niobid Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language