Definitions from Wiktionary ( )

▸ noun:  Any of the fleshy fruiting bodies of fungi typically produced above ground on soil or on their food sources (such as decaying wood).
▸ noun:  A fungus producing such fruiting bodies.
▸ noun:  Champignon or Agaricus bisporus, the mushroom species most commonly used in cooking.
▸ noun:  Any of the mushroom-shaped pegs in bar billiards.
▸ noun:  (architecture) A concrete column with a thickened portion at the top, used to support a slab.
▸ noun:  (obsolete, figurative) One who rises suddenly from a low condition in life; an upstart.
▸ noun:  (figurative) Something that grows very quickly or seems to appear suddenly.
▸ adjective:  Having characteristics like those of a mushroom, for example in shape or appearance, speed of growth, or texture.
▸ verb:  (intransitive, figurative) To grow quickly to a large size or rapidly increase in scope or scale.
▸ verb:  (intransitive) To gather mushrooms.
▸ verb:  (intransitive) To form the shape of a mushroom.
▸ verb:  (ballistics, of a bullet) To form the shape of a mushroom when striking a soft target.
▸ noun:  Ellipsis of mushroom cloud. [A large cloud of smoke, flame and debris that rises into the sky as a result of a large explosion, especially after a nuclear explosion, characterized by a long shaft rising from the ground into a much-larger or more-spread-out top, reminiscent of a mushroom in shape.]

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