Tonic is a Boston term. I'm not sure how far it extends regionally - it may be another odd New England term like frappe. It always throws me for a loop because I tend to think of tonic as having the words "gin and" preceding it.

I don't know if it's used elsewhere.

In reply to Re: Etymologies and Dialects by ailie
in thread I refer to a non-specified carbonated beverage as a: by Petruchio

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