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n. pl. pi·le·i (-lē-ī′)
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.
[New Latin pīleus, from Latin, cap.]
n, pl -lei (-lɪˌaɪ)
(Botany) the upper cap-shaped part of a mushroom or similar spore-producing body
[C18 (botanical use): New Latin, from Latin: felt cap]
pi•le•us(ˈpaɪ li əs, ˈpɪl i-)
n., pl. pi•le•i (ˈpaɪ liˌaɪ, ˈpɪl iˌaɪ)
1. the horizontal portion of a mushroom, bearing gills, tubes, etc., on its underside; a cap.
2. the umbrella or bell of a jellyfish.
4. a felt skullcap worn by the ancient Romans and Greeks.
[1750–60; < New Latin; Latin pīleus felt cap; akin to Greek pîlos felt, felt cap]
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|Noun||1.||pileus - a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom|
fungus - an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia