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Entry 3 senses Webster, 1913

Pileus

· Pi·le·us · IPA /ˈpɪliəs/
01 n. A kind of skull cap of felt.
pl. Pilei ((#))
  1. 1.
    A kind of skull cap of felt.(Rom. Antiq.)
  2. 2.
    The expanded upper portion of many of the fungi. See Mushroom.(Bot.) See: Mushroom
  3. 3.
    The top of the head of a bird, from the bill to the nape.(Zool.)