/ Dictionary / Index V vivianite: Meaning and Definition of Find definitions for: viv•i•an•ite Pronunciation: (viv'ē-u-nīt"), [key] — n. a secondary mineral, hydrous ferrous phosphate, Fe(PO)&multiplydot;8HO, occurring in the form of pale blue crystals or powder. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Viviani vivid Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language