Petasus

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

petasus
pĕtăsus, i, m., = πέτασος, a travelling hat or cap, with a broad brim (cf.: pileus, cucullus). I L...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.