/ Dictionary / Index B block lava: Meaning and Definition of Find definitions for: block' la"va Pronunciation: [key] — Geol. Geol. basaltic lava in the form of a chaotic assemblage of angular blocks; aa. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Block Island block letter Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language