scarf-cloud

scarf cloud

noun
pileus ( def 3 ).
Dictionary.com Unabridged

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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