1. a large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb); [syn: mushroom, mushroom cloud, mushroom-shaped cloud]
WordNet (r) 3.0 (2006):
mushroom-shaped cloud
n 1: a large cloud of rubble and dust shaped like a mushroom and
rising into the sky after an explosion (especially of a
nuclear bomb) [syn: mushroom, mushroom cloud,
mushroom-shaped cloud]