noun, plural la·pil·li [luh-pil-ahy] /ləˈpɪl aɪ/.
Origin of lapillus
Examples from the Web for lapilli
The solid matter thrown out by volcanoes consists of lapilli, scoriae, dust and bombs.The San Francisco Calamity|Various
We observed, that when lava abounded, the projection of rocks and lapilli either ceased altogether, or became of small amount.
A cubic mile of material is said to have been thrown out in the form of lapilli and dust by the successive explosions.Wealth of the World's Waste Places and Oceania |Jewett Castello Gilson
There was no pumice shown to me, but the dust and lapilli all seemed to be composed of comminuted old rock.Complete Story of the San Francisco Horror|Richard Linthicum
These ejections were followed by dark sand, with lapilli and small fragments of scori of the same colour.The Eruption of Vesuvius in 1872|Luigi Palmieri