The Collaborative International Dictionary
Mushroom \Mush"room\, a.
Of or pertaining to mushrooms; as, mushroom catchup.
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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 (Zo["o]l.), 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.
Usage examples of "mushroom spawn".
Essential fats and amino acids the building blocks of life may seek to escape into the earth, there to develop into mushroom spawn that lies dormant until a time of maximum opportunity.