petasus /petˈə-səs/

1. A low broad hat worn by the Greeks in antiquity
2. Either the broad petasus that Hermes is represented as wearing in early Greek art or, by association, the winged hat he wears in later art

• flat-earther
• flat-earthers
• flat file
• flat files
• flatfish
• flatfishes
• flat-foot
• flat-footed
• flat-footedness
• flathead
• flatheads
• flatiron
• flatirons
• flatland
• flatlands
• flatlet
• flatlets
• flatline
• flatlined
• flatliner
• flatliners
• flatlines
• flatling
• flatlings
• flatlining