Dictionary:

pileus

  (pī'lē-əs)

1. Botany. The umbrellalike fruiting structure forming the top of a stalked fleshy fungus, such as a mushroom; the cap.
2. A brimless round skullcap worn by ancient Romans.
3. See caul (sense 1).

[New Latin pīleus, from Latin, cap.]

A shallow, auxiliary cloud in the shape of a cap above, or attached to, the top of a cumuliform cloud.

The cap of a mushroom or toadstool.

The noun has one meaning:

Meaning #1: a fruiting structure resembling an umbrella that forms the top of a stalked fleshy fungus such as a mushroom
  Synonym: cap

Pileus may mean:

In science:

• Pileus (mycology), the "cap" of a mushroom.
• Pileus (meteorology), a type of cloud formation.

In historic clothing:

• Pileus (hat), a style of cap worn by ancient Romans.

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