lapillus

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la·pil·lus

L0047500 (lə-pĭl′əs)n. pl. la·pil·li (-pĭl′ī′) A small, solidified fragment of lava.
[Latin, diminutive of lapis, stone.]

lapillus

(ləˈpɪləs) n, pl -li (-laɪ) (Geological Science) a small piece of lava thrown from a volcano[C18: Latin: little stone]

la•pil•lus

(ləˈpɪl əs)

n., pl. -pil•li (-ˈpɪl aɪ) a small stony particle ejected from a volcano. [1740–50; < Latin: pebble, diminutive of lapis stone]

lapillus

a small stone ejected by a volcano.See also: Geology