< /ləˈpɪl aɪ/.

  1. a small stony particle ejected from a volcano.

noun plural -li (-laɪ)

  1. a small piece of lava thrown from a volcano

Plural lapilli (lə-pĭl′ī′)

  1. A small fragment of lava, between 2 and 64 mm in size, blown out from a volcano.

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