Definition of lapilli in English:

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Pronunciation: /ləˈpɪlʌɪ/

plural noun

Rock fragments ejected from a volcano.
Example sentences
  • Some matrix ash samples were also analysed to ensure that the complete geochemical range could be assessed, and where lapilli were not available.
  • We infer that the framework through which transport took place consists of lapilli lodged within elutriation networks similar to those observed in the field (vertical ‘pipes’ having elongated sheet-like forms in three dimensions).
  • We thought they might be lapilli - little volcanic hailstones that form when you have an eruption of volcanic ash and it coagulates and falls out.


Mid 18th century (in the general sense 'stones, pebbles'): via Italian from Latin, plural of lapillus, diminutive of lapis 'stone'.

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