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block lava

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noun Geology.
  1. basaltic lava in the form of a chaotic assemblage of angular blocks; aa.

Origin of block lava

First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for block lava

block lava

noun
  1. volcanic lava occurring as rough-surfaced jagged blocks
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012