-_ləs noun
( plural lapil·li -ˌlī, -(ˌ)lē)
Etymology: Latin, small stone, diminutive of lapis stone
1. : a stony or glassy fragment of lava 1/4 to 1 1/2 inches in diameter thrown out in a volcanic eruption : volcanic cinder — usually used in plural
showers of ashes and lapilli — Norman Douglas
2. : otolith