volcanic ash

uncountable usually

(geology) Fragments of pulverized rock, minerals and volcanic glass created during a volcanic eruption.

Japanese Meaning

火山噴火時に噴出される、粉砕された岩石、鉱物、火山ガラスなどの微細な破片

After the eruption, the airplane diverted its route to avoid flying through the volcanic ash cloud.

噴火後、飛行機は火山灰の雲を避けるために航路を変更した。

Sense（1）

(geology) Fragments of pulverized rock, minerals and volcanic glass created during a volcanic eruption.

volcanic ashes

（ plural ）