/ Dictionary / Index P pillow lava: Meaning and Definition of Find definitions for: pil'low la"va Pronunciation: [key] — Geol. Geol. lava in the form of an agglomeration of rounded, pillow-shaped masses, the result of subaqueous or subglacial volcanic eruption. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pillow lace pillow sham Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language