Word for "the question this one was closed as a dupe of"

Is there a simple term for the question this one was closed as a dupe of other than "the question this one was closed as a dupe of", because "the question this one was closed as a dupe of" is pretty long and unwieldy and much in need of a simpler term than "the question this one was closed as a dupe of".

It's not a single word, but the duplicated question seems like an obvious answer.

In the context of SE questions there's often a certain amount of debate over whether the later question is identical to the one cited as a duplicate, so I tend to avoid the term original.

Admittedly this approach deprives me of a convenient noun form, but I think it's less contentious to refer to it as the earlier question. But if you really want a noun I suggest antecedent.

Ideally on SE one would like to refer to the earlier question as the archetype, to imply we've already got a generic/canonical answer for any questions similar to the one currently being flagged as a later duplicate. Sadly, that isn't always the case, so people can often argue theirs isn't a duplicate.

In programming, I've sometimes heard original used as a relative term, as in "the original of the new bug is a year old." Perhaps this extends to online Q&A discussions.

Since each question is closed as a duplicate of exactly one, the relationship is unique and you can probably refer to it in context as simply the duplicate, even if that's somewhat backwards.