IPA: /ˈnɒnˌdrɪŋ.kər/
KK: /ˈnɒnˌdrɪŋkər/
A person who chooses not to consume alcoholic drinks.
At the party, she was the only nondrinker among her friends who were all enjoying cocktails.
Nondrinker → It is formed from "non-" (meaning not) and "drinker" (from the verb "drink", which comes from Old English "drincan", meaning to consume liquid). The word "nondrinker" refers to a person who does not consume alcoholic beverages.
Think of 'non-' meaning not, and 'drinker' referring to someone who consumes liquid. So, a nondrinker is simply someone who does not drink.