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pile on
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pilewort
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pileus

pi·le·us [ plee əss, píllee əss ] (plural pi·le·i [ plee , píllee  ])


noun 
Definition:
 
1. botany cap of mushroom: the top cap-shaped part of a mushroom or other fungus

2. marine biology body of jellyfish: the part of the body of a jellyfish that resembles an opened umbrella

3. dress Roman skullcap: a close-fitting brimless cap worn by ancient Romans

[Mid-18th century. < Latin pileus "felt cap"]
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