noun
lethal radioactive fallout; atomic dust
Refers specifically to the deadly radioactive particles that fall after a nuclear explosion. Often used in historical or anti-nuclear contexts.
死の灰は広島と長崎に甚大な被害をもたらした。
The lethal radioactive fallout caused enormous damage in Hiroshima and Nagasaki.
核実験による死の灰が風に乗って遠くまで運ばれた。
Atomic dust from the nuclear test was carried far away by the wind.