Pĕt'a-sūs, n.
n. [Lat. petasus, Gr. πέτασος, a spreading or broad-brimmed hat, fr. πεταννύναι, to spread out.]
- (Antiq.) The winged cap of Mercury; a broad-brimmed hat.
- (Arch.) A cupola having the form of a broad-brimmed hat. Crabb.
n. [Lat. petasus, Gr. πέτασος, a spreading or broad-brimmed hat, fr. πεταννύναι, to spread out.]