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lapilli
This term is used primarily in volcanology and geology to describe a specific size class of tephra. It is distinguished from volcanic ash, which is smaller than 2 millimeters, and volcanic bombs, which are larger than 64 millimeters. The term carries a technical, scientific register and is rarely used in casual conversation unless describing a geological site.
Grammatically, lapilli is the plural form of the Latin word lapillus. In English scientific writing, it is treated as a plural noun. While some writers may attempt to use it as a collective mass noun, it traditionally refers to the individual fragments of rock.
Meanings
Examples
The ground was covered in a thick layer of lapilli after the eruption.
Look at these lapilli samples from the cinder cone.
The pyroclastic fall consisted mainly of ash and lapilli.
I wonder if these lapilli were ejected during the first phase of the event.
The geologist pointed to the distinct strata of lapilli in the cliff side.
These lapilli are much more porous than the surrounding basalt.
We found a high concentration of lapilli near the volcanic vent.
The rain of lapilli damaged several rooftops in the village.