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pillow lava

noun

, Geology.
  1. lava in the form of an agglomeration of rounded, pillow-shaped masses, the result of subaqueous or subglacial volcanic eruption.

pillow lava

noun

  1. lava that has solidified under water, having a characteristic structure comprising a series of close-fitting pillow-shaped masses

pillow lava

/ pĭl′ō /

  1. Lava that forms from an underwater eruption and is characterized by pillow-shaped masses. Pillow lava forms when hot lava is suddenly exposed to cold water, forming a sacklike membrane that is filled with additional cooling and solidifying lava. The outer membrane is usually finer grained than the inner lava.

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Word History and Origins

Origin of pillow lava1

First recorded in 1900–05

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pillow lacepillow sham

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