ˈpīlēəs, ˈpil- noun
( plural pi·lei -ēˌī)
Etymology: New Latin, from Latin pilleus, pileus felt cap — more at pile (hair)
1. : an umbrella-shaped upper cap of many fungi (as the mushrooms and other basidiomycetes)
2.
[Latin pilleus, pileus ]
a. : a pointed or close-fitting cap worn by ancient Romans
b. : a cap worn by some ecclesiastics
3. : the umbrella of a jellyfish
4. : a cloud resembling a cap that sometimes appears above and partially obscures the bulging top of a cumulus cloud