Disputed. Possibly from Old English ātor (“poison”), and thus related to English atter. Alternatively from hat-makers suffering from Korsakoff's syndrome due to handling mercury-contaminated felt.
"mad-as-a-hatter." YourDictionary, n.d. Web. 10 December 2018. <https://www.yourdictionary.com/mad-as-a-hatter>.
mad-as-a-hatter. (n.d.). Retrieved December 10th, 2018, from https://www.yourdictionary.com/mad-as-a-hatter
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