- a type of brimless cap worn in ancient Rome
- Bot. the cap of a mushroom, or the similar part of the fruiting body of other fungi
- the umbrella-shaped disk of a jellyfish
Origin of pileusfrom Classical Latin pilleus (or pilleum), felt cap, akin to pilus, hair: see pile
- Botany The umbrellalike fruiting structure forming the top of a stalked fleshy fungus, such as a mushroom; the cap.
- A brimless round skullcap worn by ancient Romans.
- See caul.
Origin of pileusNew Latin pīleus from Latin cap
Latin pileus (“a felt cap").