The Collaborative International Dictionary of English v.0.48:

Barmaid \Bar"maid`\, n.
   A girl or woman who attends the customers of a bar, as in a
   tavern or beershop.
   [1913 Webster]

         A bouncing barmaid.                      --W. Irving.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barmaid
    n 1: a female bartender

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "barmaid":
   barkeep, barkeeper, barman, bartender, bootlegger, brewer,
   brewmaster, busboy, carhop, counterman, distiller, headwaiter,
   hostess, liquor dealer, liquor store owner, mixologist, moonshiner,
   publican, sommelier, tapster, tapstress, vintner, waiter, waitress,
   wine merchant, wine steward