lapillus

Noun

1. A fragment of lava ejected from a volcano.
   • They also found rounded granules that are probably accretionary lapilli — volcanic hailstones, formed as material gathers in the air. - 2007 May 8, Henry Fountain, “It’s Still Dark Out, So Why Are the Birds Singing...
2. One of the otoliths in finfish.

   Coordinate Terms: sagitta asteriscus