Noun pileus has 1 sense

1. cap, pileus - a fruiting structure resembling an umbrella that forms the top of a stalked fleshy fungus such as a mushroom
   --₁ is a kind of plant part, plant structure
   --₁ is a part of fungus
   

Pileus

Noun: A tall, cylindrical cloud formation often appearing like a cap on top of cumulonimbus or other types of towering clouds.

Example Sentence:

The pileus cloud formation illuminated by the setting sun was a breathtaking sight.

Noun: A conical felt or leather cap worn by ancient Romans, typically freed slaves, as a symbol of emancipation or given as a badge of servitude.

Example Sentence:

The freedman proudly wore his pileus as a declaration of his newfound freedom.

Noun: The fleshy, umbrella-like cap of a mushroom or toadstool.

Example Sentence:

She added the pileus of the mushroom to the soup, enhancing its flavor and texture.

Related Products on Amazon:

• Books about Pileus Clouds
• Pileus Hats on Amazon
• Pileus Mushroom Growing Kit