Definition of hatter noun from the Oxford Advanced Learner's Dictionary

 

hatter

 noun
noun
BrE BrE//ˈhætə(r)//
 
; NAmE NAmE//ˈhætər//
 
(old-fashioned)
 
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  • a person who makes and sells hats
  • Idioms
    (as) mad as a hatter/a March hare
     
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    (informal) (of a person) mentally ill; very silly 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. Lewis Carroll was probably thinking of this when he created the eccentric character of the Hatter in Alice’s Adventures in Wonderland. A March hare was called mad because of the strange behaviour of hares during the mating season. More Like ThisSimiles in idioms (as) bald as a coot, (as) blind as a bat, (as) bright as a button, (as) bold as brass, as busy as a bee, as clean as a whistle, (as) dead as a/​the dodo, (as) deaf as a post, (as) dull as ditchwater, (as) fit as a fiddle, as flat as a pancake, (as) good as gold, (as) mad as a hatter/​a March hare, (as) miserable/​ugly as sin, as old as the hills, (as) pleased as Punch, as pretty as a picture, (as) regular as clockwork, (as) quick as a flash, (as) safe as houses, (as) sound as a bell, (as) steady as a rock, (as) thick as two short planks, (as) tough as old bootsSee worksheet.
    See the Oxford Advanced American Dictionary entry: hatter