Oxford Advanced American Dictionary

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

bookmaker

noun
bookmaker pronunciation English ˈbʊkmeɪkə(r) bookmaker pronunciation American ˈbʊkmeɪkər
(also informal bookie) (also British English formal turf accountant)
 
a person whose job is to take bets on the result of horse races, etc. and pay out money to people who win
bookmaking
bookmaking pronunciation English ˈbʊkmeɪkɪŋ bookmaking pronunciation American ˈbʊkmeɪkɪŋ
noun [uncountable]