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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.]


(ˈpaɪlɪəs; ˈpɪl-)
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]


(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.
3. pileum.
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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pileus - a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroompileus - 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
plant part, plant structure - any part of a plant or fungus
References in periodicals archive ?
The observed amino acid pattern in this study may have been contributed by the differences in the growth substrate, size of the pilei and species or strain of mushroom among others [20].
eryngii yield (fresh mushroom weight), biological efficiency (BE, ratio of mushrooms fresh weight to dry substrate weight expressed as a percentage), pilei color (brightness), antioxidants (selenium and ergothioneine) concentration, solids and number of mushrooms.
The materials that make up the database are transcribed interviews carried out in accordance with norms established by the Proyecto de estudio coordinado de la norma linguistica culta de las principales ciudades de Iberoamerica y de la Peninsula Iberica, initiated by PILEI (Programa Interamericano de Linguistica y Ensenanza de Idiomas), and today under the direction of ALFAL (Asociacion de Linguistica y Filologia de la America Latina).