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plural not attested
(dialect) Uncle (especially as a term of address). quotations examples
That's from the poem of the legend of Kubla Kahn's palace in the lost valley of Xanadu! Alph was the river in the legend! Unca Scrooge, this is the road to Xanadu!
1991, Don Rosa, “Return to Xanadu”, in Uncle Scrooge, volumes 261-262, page 5