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Lava that forms from an underwater eruption and is characterized by pillow-shaped masses.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) lava that has solidified under water, having a characteristic structure comprising a series of close-fitting pillow-shaped masses
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||pillow lava - lava that hardened in rounded shapes suggestive of pillows; believed to result from underwater eruptions|
lava - rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
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