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Meaning of pillow lava

pil'low la"va

Pronunciation: [key]
— Geol. Geol.
  1. 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.
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