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.
Wiktionary
n. An anchor with a shape resembling a mushroom used in mud or silt.
WordNet
n. an anchor used for semipermanent moorings; has a bowl-shaped head that will dig in however it falls
Usage examples of "mushroom anchor".
King quietly dropped the small mushroom anchor in the water to keep his boat from drifting into the muddy bank.
I took it out quickly, wading, swimming, pushing it, and used a small mushroom anchor to hold it into a very gentle tide current so that the red hat end was toward the island I thought he would use as cover when approaching.