lapillus

(lə piləs)

noun pl. lapilli

a small fragment of igneous rock, up to the size of a walnut, ejected from a volcano

Origin: L, dim. of lapis, stone

See lapillus in American Heritage Dictionary 4

noun pl. la·pil·li (-pĭlˈīˌ)
A small, solidified fragment of lava.

Origin:

Origin: Latin

Origin: , diminutive of lapis, stone

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