pileus

  1. Noun.  the cap of a mushroom.
  2. Noun.  the bell of a jellyfish.
  3. Noun.  (meteorology) a small thin cloud attached to a cumulus cloud. A cap cloud.
  4. Noun.  a conical felt hat worn in ancient Rome and Greece.

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This entry was last updated on RefTopia from its source on 3/20/2012.