火か山ざん塵じん

noun

volcanic dust

Rare technical term in geology and volcanology for fine ash particles ejected during an eruption. In everyday Japanese, 火山灰 (かざんばい) is far more common.

• 火か山ざん塵じんは、噴ふん火かの際さいに大たい気き中ちゅうに放ほう出しゅつされる微び細さいな粒りゅう子しである。

  Volcanic dust is fine particles released into the atmosphere during an eruption.