'Pileus' definitions:

Definition of 'pileus'

(from WordNet)
noun
A fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom [syn: cap, pileus]

Definition of 'Pileus'

From: GCIDE
  • Pileus \Pi"le*us\, n.; pl. Pilei. [L., a felt cap.]
  • 1. (Rom. Antiq.) A kind of skull cap of felt. [1913 Webster]
  • 2. (Bot.) The expanded upper portion of many of the fungi. See Mushroom. [1913 Webster]
  • 3. (Zool.) The top of the head of a bird, from the bill to the nape. [1913 Webster]