Co-uncle meaning

Of a man, an uncle of one's niece or nephew who is not one's brother; a co-brother-in-law as common uncle to the children of two men's married siblings.
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A man's brother, as uncle in common to the children of a third sibling.

My nephew came up for the summer with my brother and co-uncle George.

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Origin of co-uncle

  • co- +‎ uncle

    From Wiktionary