Medical Dictionary
pileus
noun pi·le·us \ˈpī-lē-əs\
plural pi·lei \-lē-ˌī\
Medical Definition of PILEUS
: 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
Seen & Heard
What made you want to look up pileus? Please tell us where you read or heard it (including the quote, if possible).