co-uncles

Noun

co-uncle (plural co-uncles)

1. 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.
   • Cicero continued however to write anxiously to Atticus, his co-uncle, about the young man's remarkable gifts and unsatisfactory character.
     [Cicero's younger brother married Atticus's sister, and the couple had a son Quintus; Cicero and Atticus were thus co-uncles to Quintus, the nephew they had in...1975, Elizabeth Rawson, Cicero: a portrait, page 195
2. 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.