petasus

In Greek antiquity, a low-crowned, broad-brimmed felt hat worn characteristically by travelers, and a common attribute of Hermes.

Hence The winged hat or cap worn by Mercury in late artistic types.

[capitalized] The typical genus of the family Petasidæ.

The winged cap of Mercury; also, a broad-brimmed, low-crowned hat worn by Greeks and Romans.

A broad-brimmed, low-crowned hat worn by the Ancient Greeks and Romans.