block lava

noun

Geology.

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

block lava

noun

1. volcanic lava occurring as rough-surfaced jagged blocks

Word History and Origins

Origin of block lava¹

First recorded in 1910–15

Example Sentences

Multiple efforts to build barriers to block lava flows from homes failed.

Read more on Los Angeles Times

But in traveling, "on, on," is the word; so on we went, stumbling up through the triturated and block lava, as if Fame, or something else equally valuable, had been at the summit.

Read more on Project Gutenberg