Definition of pileus
1
[Latin]
: a pointed or close-fitting cap worn by ancient Romans
2
: the convex, concave, or flattened spore-bearing structure of some basidiomycetes that is attached superiorly to the stem and typically is expanded with gills or pores on the underside
— called also cap
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Merriam-Webster unabridged
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Time Traveler for pileus
The first known use of pileus was in 1663
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