pillow lava

English

Noun

pillow lava (countable and uncountable, plural pillow lavas)

  1. (geology, uncountable) The rock type, resembling pillows, typically formed when lava emerges from an underwater volcanic vent or a lava flow enters the ocean.
  2. (geology, countable) A rock of that type.
    • 2004, Richard Fortey, The Earth, Folio Society, published 2011, page 45:
      Ancient pillow lavas are easily recognisable. I first saw them underneath a lighthouse on the coast near Fishguard in western Wales […]

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