Noun
A kind of skull cap of felt.
The expanded upper portion of many of the fungi. See Mushroom.
The top of the head of a bird, from the bill to the nape.
Source: Webster's dictionaryHe ordered that it be changed to a helmet.sfn Delacroix's figure wears a pileus, and Bartholdi at first considered placing one on his figure as well. Source: Internet
These species may be arranged into the variety, cumulus radiatus; and may be accompanied by up to seven supplementary features, cumulus pileus, velum, virga, praecipitatio, arcus, pannus, and tuba. Source: Internet
The cap is a pileus (liberty cap) that in Roman times was given to slaves on the day of their emancipation – freedom from slavery. Source: Internet