hatter
Concise Oxford English Dictionary © 2008 Oxford University Press:
hatter/ˈhatə(r)/
▶noun a person who makes and sells hats.
– phrases
(as) mad as a hatter informal completely mad. [with allusion to the effects of mercury poisoning from the use of mercurous nitrate in the manufacture of felt hats.]
(as) mad as a hatter informal completely mad. [with allusion to the effects of mercury poisoning from the use of mercurous nitrate in the manufacture of felt hats.]
'hatter' also found in these Oxford entries:
