co-aunt

Meaning

1. noun of a woman, an aunt of one's niece or nephew who is not one's sister; a co-sister-in-law as common aunt to the children of two women's married siblings.
2. noun a woman's sister, as aunt in common to the children of a third sibling

Similar words

co-uncle double aunt aunt aunt-in-law co-sister-in-law sister-in-law sister-wife maternal aunt co-sibling-in-law niece