(n) The airborne reminants of a massive explosiion, usually dust and debris blasted high into the atmosphere. In the case of vulcanos it is usually ash or superheated pumace, and it falls back to earth as acid rain, over a widespread area. Also used to describe the ash and radioactive debris that falls back to earth from a nuclear mushroom cloud.
1. Pompeii was covered by vulcanic fallout from Mt. Vesuvious.
2. I built a fallout shelter during the cold war when I thought the Russians were gonna nuke us.
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