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Meaning of pileus

pi•le•us

Pronunciation: (pī'lē-us, pil'ē-), [key]
— pl. pi•le•i pi•le•us
  1. the horizontal portion of a mushroom, bearing gills, tubes, etc., on its underside; a cap. See diag. under
    1. the umbrella or bell of a jellyfish.
    2. pileum.
  2. Also calleda small, thin cloud just above or attached to a growing cumulus cloud.
  3. a felt skullcap worn by the ancient Romans and Greeks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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