Citations:cousin-uncle

Noun: "one's parent's male first cousin"

 * 1875, Charles Harrison Vilas, Genealogy of the Descendants of Peter Vilas, self-published, pages 17–18:
 * Cousin-uncles and -aunts, are respectively the male and female cousins of one's father or mother. ¶ And it is obviously more appropriate for the cousin-uncle to be called “uncle,” and the cousin-aunt, “aunt,” than “cousin.”