lapilli

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la·pil·lus

 (lə-pĭl′əs)
n. pl. la·pil·li (-pĭl′ī′)
A small, solidified fragment of lava.

[Latin, diminutive of lapis, stone.]
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.
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