noun
Technical term in volcanology for a cone-shaped landform built from fragmented volcanic material ejected during eruptions.
富士山の周辺には多くの砕屑丘が見られる。
Many pyroclastic cones can be seen around Mt. Fuji.
Synonym also meaning 'pyroclastic cone'; 砕屑丘 uses different kanji for 'fragment' (砕屑 vs. 火砕).
Compound of 砕屑 (さいせつ, 'clastic' or 'fragmental') and 丘 (きゅう, 'hill' or 'cone'), referring to a hill formed from fragmented volcanic material.