noun
A volcanic landform built from ejected fragments around a vent; a technical term in volcanology.
臼状火山は、噴火で放出された岩片が積もってできる。
A pyroclastic cone is formed by the accumulation of rock fragments ejected during an eruption.
Synonym for pyroclastic cone; 臼状火山 is a less common alternative term.
Compound of 臼状 (mortar-shaped) and 火山 (volcano), describing the cone's shape.