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

 

teetotaller

 noun
(British English)(US English teetotaler)noun
BrE BrE//ˌtiːˈtəʊtlə(r)//
 
; NAmE NAmE//ˌtiːˈtoʊtlər//
 
 
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a person who does not drink alcohol She’s a strict teetotaller.