Let’s say X is cloned to make Y and Y is cloned to make Z. Is there a word that uniquely identifies X in relation to Y? How about identifying X in relation to Z?
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Now, if the source itself is a clone, I'd say we could refer to it as the clone source's source.
Note: If you're writing scifi, I'd suggest source and grandsource, but the latter I just made up.
I guess I don't see what is wrong with parent. If I were cloning a plant, the parent plant would be the parent to all the clones.
When they tissue culture hostas and make clones I have seen the source plant called the mother plant.
I guess you could use donor if you wanted to get all clinical. Or perhaps The Clone Daddy if you wanted to be hip.
I think originator is a reasonable word for a progenitor of a clone, but it's not clear to me whether it should be the first in the line of descendants or the most direct ancestor.