One whose occupation is the manufacture, selling, or repair of hats. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "hatter" in a sentence
"A man without a mate was a "hatter" -- "his hat covers his family"."
"(The expression "Mad as a hatter" comes from the damage done by exposure to the fumes of mercury."
"The hatter was the man whom the flower vendor remembered seeing a few days before, prowling around the Aldaya mansion."