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pileus - What does it mean?

Definition of 'pileus'

English

(wikipedia)

Noun

(pilei)
  • the cap of a mushroom.
  • the bell of a jellyfish
  • (meteorology) a small thin cloud attached to a cumulus cloud. A cap cloud
  • a conical felt hat worn in ancient Rome and Greece
  • The top of the head of a bird, from the bill to the nape.