Main Entry: pi·le·us

Pronunciation: \ˈpī-lē-əs\

Function: noun

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

: the convex, concave, or flattened spore-bearing structure of some basidiomycetous fungi that is attached to the top of the stem and typically is expanded with gills or pores on the underside—called also cap