Co-aunt Definition
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.
Wiktionary
A woman's sister, as aunt in common to the children of a third sibling.
Wiktionary
Other Word Forms of Co-aunt
Noun
Singular:
co-auntPlural:
co-auntsOrigin of Co-aunt
-
co- + aunt
From Wiktionary
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