nounjump to other results
NAmE//mɑrtʃ//[uncountable, countable] (abbreviation Mar.)
(of a person) mentally ill; very silly From the Mad Hatter, a character in Lewis Carroll's Alice's Adventures in Wonderland. Because of the chemicals used in hat-making, workers often suffered from mercury poisoning, which can cause loss of memory and damage to the nervous system. A March hare was called mad because of the strange behavior of hares during the mating season.
(as) mad as a hatter/a March hare (informal)jump to other results