Main Entry: pi·le·us

Pronunciation: \ˈpī-lē-əs\

Function: noun

Inflected Form(s): plural pi·lei \-lē-ˌī\

Etymology: New Latin, from Latin

Date: 1715

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