1. Small fragments of rock and lava ejected from a volcano during an eruption, typically ranging from 2 to 64 millimeters in diameter.
Usage: Plural of lapillus; used in geology and volcanology; Intermediate in size between ash and larger volcanic bombs

Examples

• The volcano scattered lapilli across the surrounding landscape during the eruption.
• Geologists collected samples of lapilli to study the composition of the volcanic material.
• The ground was covered with a layer of lapilli after the explosive event.
• Lapilli deposits help scientists understand the intensity and direction of past volcanic eruptions.
• Unlike fine ash, lapilli are large enough to be individually visible to the naked eye.