/ Dictionary / Index V volcanic tuff: Meaning and Definition of Find definitions for: volcan'ic tuff' Pronunciation: [key] tuff&hasp;. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. volcanic neck volcanism 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