pileus Meaning, Definition & Usage

  1. noun a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom
    cap.

WordNet

Pi"le*us noun
Etymology
L., a felt cap.
Wordforms
plural Pilei
Definitions
  1. (Rom. Antiq.) A kind of skull cap of felt.
  2. (Bot.) The expanded upper portion of many of the fungi. See Mushroom.
  3. (Zoöl.) The top of the head of a bird, from the bill to the nape.

Webster 1913