also: げんしうん
noun
atomic cloud; mushroom cloud
Refers to the cloud formed by a nuclear explosion, often specifically the mushroom cloud.
原子雲が広島の空に立ち上った。
An atomic cloud rose into the sky over Hiroshima.
More common and colloquial term for mushroom cloud; 原子雲 is more technical and specifically refers to the cloud from a nuclear explosion.
Compound of 原子 (atomic) and 雲 (cloud).