The Collaborative International Dictionary of English v.0.48:
Barkeeper \Bar"keep`er\, n. One who keeps or tends a bar for the sale of liquors. [1913 Webster]WordNet (r) 3.0 (2006):
barkeeper n 1: an employee who mixes and serves alcoholic drinks at a bar [syn: bartender, barman, barkeep, barkeeper, mixologist]