mushroom anchor

noun Nautical.
a stockless anchor having a bowlike head, used chiefly for semipermanent moorings.

Origin:
1835–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
mushroom anchor

noun
an anchor used for semipermanent moorings; has a bowl-shaped head that will dig in however it falls 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Normally, the three to five ton mushroom anchor was deployed in heavy weather.
Each mooring must consist of a mushroom anchor with a chain capable of holding the boat in place under adverse weather conditions.
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