an inundation of moving or drifting sand.

With plural agreement. Small stones or pebbles; now only spec. of the fragments of stone ejected from volcanoes.

With plural agreement. Small fragments of rock, esp. pumice, ejected from a volcano. Cf. lapilli, n.

Matter ejected from volcanoes in the form of lapilli.

Dust and rock fragments that have been ejected into the air by a volcanic eruption. Frequently attributive.