the Mad Hatter
/ðə ˌmæd ˈhætə(r)/
/ðə ˌmæd ˈhætər/
- a character in Alice in Wonderland by Lewis Carroll. The Mad Hatter, who wears a tall hat, holds a tea party with Alice, the March Hare and the Dormouse. The expression 'as mad as a hatter', meaning completely crazy, was already common when Carroll wrote the book.