abstainer
abs·tai·ner
noun
1.
practices self denial as spiritual discipline
2.
a person who refrains from drinking intoxicating beverages
Origin
From Middle English absteyner, equivalent to abstain + -er.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.