co-uncle

Meaning

1. noun 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.
2. noun 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.

Similar words

co-aunt co-brother-in-law double uncle brother-in-law uncle-in-law double-uncle auncle uncle half-uncle first cousin