Mush·room, a.
 1. Of or pertaining to mushrooms; as, mushroom catchup.
 2. Resembling mushrooms in rapidity of growth and shortness of duration; short-lived; ephemerial; as, mushroom cities.
 Mushroom anchor, an anchor shaped like a mushroom, capable of grasping the ground in whatever way it falls.
 Mushroom coral Zool., any coral of the genus Fungia. See Fungia.
 Mushroom spawn Bot., the mycelium, or primary filamentous growth, of the mushroom; also, cakes of earth and manure containing this growth, which are used for propagation of the mushroom.
 mushroom cloud, a cloud of smoke rising and then spreading laterally to take on the shape of a mushroom -- caused by large fires or explosions, esp. nuclear explosions.

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 mushroom cloud
      n : 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-shaped cloud]