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Pillow lava


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 2011, p. 45:
      Ancient pillow lavas are easily recognisable. I first saw them underneath a lighthouse on the coast near Fishguard in western Wales []