pileus

[pahy-lee-uhs, pil-ee-]
noun, plural pilei [pahy-lee-ahy, pil-ee-ahy] , for 1, 2, 4, pileus for 3.
1.
Mycology. the horizontal portion of a mushroom, bearing gills, tubes, etc., on its underside; a cap. See diag. under mushroom.
2.
Zoology.
a.
the umbrella or bell of a jellyfish.
3.
Also called cap cloud, scarf cloud. Meteorology. a small, thin cloud just above or attached to a growing cumulus cloud.
4.
a felt skullcap worn by the ancient Romans and Greeks.

Origin:
1750–60; < Neo-Latin, special use of Latin pīleus skullcap; akin to Greek pîlos felt, felt cap

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World English Dictionary
pileus (ˈpaɪlɪəs, ˈpɪl-)
 
n , pl -lei
the upper cap-shaped part of a mushroom or similar spore-producing body
 
[C18 (botanical use): New Latin, from Latin: felt cap]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pileus   (pī'lē-əs)  Pronunciation Key 
Plural pilei (pī'lē-ī')
The umbrellalike fruiting structure forming the top of a fleshy fungus. It is supported by the stipe. The cap of a mushroom is a pileus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

pileus

close-fitting, brimless hat worn by the ancient Romans and copied from the Greek sailor's hat called the pilos. In Roman times the head was generally left uncovered, but commoners and freed slaves sometimes wore the felt pileus

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The white pileus cloud above the plume probably formed when water vapor in the rapidly rising air cooled and condensed.
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