Wiktionary
n. A hard round black felt hat with a narrow brim; no longer commonly worn
WordNet
Wikipedia
The bowler hat, also known as a bob hat, derby (US), or bombín, is a hard felt hat with a rounded crown originally created in 1849 for the British soldier and politician Edward Coke, the younger brother of the 2nd Earl of Leicester. The bowler hat was popular with the working class during the Victorian era, and later on with the middle and upper classes in the United Kingdom and the eastern United States. Later in the United Kingdom, it would come to be worn as civilian work dress by former officers of the Queen's Guard. In Bolivia, women of Quechua people have worn bowler hats since the 1920s when British railway workers introduced them there.
Usage examples of "bowler hat".
Planting his bowler hat firmly on his head he mounted his bicycle and pedalled off down the drive.
Occasionally late at night the wheel chair, with its dark occupant wearing his bowler hat, could be seen in the shadows by the back gate waiting and watching with an implacable futility of purpose the spiked wall over which the undergraduates no longer climbed.
In his tight, almost bursting black suit and farcical bowler hat he looked rather like a Japanese wrestler on his day off.
Beside him was a squat figure in black with a bowler hat placed firmly on the middle of his head.
He wore a brown bowler hat he had picked up on the road to San Antonio some years before.
He also looked unusually dapper for a robotic horse, as Hackworth's bowler hat was perched on top of his head.
Fudge had panted, tipping a large amount of water out of the rim of his bowler hat into his pocket.
Fudge was a portly man who often sported a lime-green bowler hat, though today he had dispensed with it.
He told the tree of his journeyings, of the little hairy man and of the small fair folk who stole his bowler hat.
The car came even of the house just as lightning flashed, and in that instant, Alex got a good look at the driver, or at least the shape of the driver outlined in the flash, and he saw that it was a man with a cigar in his mouth and a bowler hat on his head.