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LAPILLI (pl. of Ital. lapillo, from Lat. lapillus, dim. of lapis, a stone)
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LAPILLI (pl. of Ital. lapillo, from Lat. lapillus, dim. of lapis, a stone), a name applied to small fragments of lava ejected from a volcano. They are generally subangular in shape and vesicular in structure, varying in size from a pea to a walnut. In the Neapolitan dialect the word becomes rapilli—a form sometimes used by English writers on volcanoes. (See VOLCANOES.)