tril ‧ by /ˈtrɪlbi/ BrE AmE ( also ˌtrilby ˈhat ) noun ( plural trilbies ) [countable] especially British English
[ Date: 1800-1900 ; Origin: Trilby , female character in the book Trilby (1894) by George Du Maurier, who in the stage version of the book wore such a hat ]
a man’s soft ↑ felt hat