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pileus

[pahy-lee-uh s, pil-ee-] /ˈpaɪ li əs, ˈpɪl i-/
noun, plural pilei
[pahy-lee-ahy, pil-ee-ahy] /ˈpaɪ liˌaɪ, ˈpɪl iˌaɪ/ (Show IPA),
for 1, 2, 4, pileus for 3.
1.
Mycology. the horizontal portion of a mushroom, bearing gills, tubes, etc., on its underside; a cap.
2.
Zoology.
  1. the umbrella or bell of a jellyfish.
  2. pileum.
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 of pileus
1750-1760
1750-60; < New Latin, special use of Latin pīleus skullcap; akin to Greek pîlos felt, felt cap
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for pileus

pileus

/ˈpaɪlɪəs; ˈpɪl-/
noun (pl) -lei (-lɪˌaɪ)
1.
the upper cap-shaped part of a mushroom or similar spore-producing body
Word Origin
C18 (botanical use): New Latin, from Latin: felt cap
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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pileus in Science
pileus
  (pī'lē-əs)   
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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