Pillow lava

noun

Definitions

Noun
  1. 1
    The rock type, resembling pillows, typically formed when lava emerges from an underwater volcanic vent or a lava flow enters the ocean. uncountable
  2. 2
    lava that hardened in rounded shapes suggestive of pillows; believed to result from underwater eruptions wordnet
  3. 3
    A rock of that type. countable

    "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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