Definition of “pileus”
noun:
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The cap of a mushroom.
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The bell of a jellyfish.
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A small thin cloud attached to a cumulus cloud. A cap cloud.
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A conical felt hat worn in ancient Rome and Greece.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
The top of the head of a bird, from the bill to the nape.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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