Pileus

pil′ē-us, n. a Roman conical cap: ( bot. ) the summit of the stipe bearing the hymenium in some fungi:— pl. Pil′ei (-ī).— adjs. Pil′ēate , -d , fitted with a cap: having the form of a cap or hat; Pil′ēiform .— n. Pilē′olus , a little pileus:— pl. Pilē′oli . [L. pileatus — pileus , a cap of felt.]