co-aunt ‎(plural co-aunts)

  1. 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. a woman's sister, as aunt in common to the children of a third sibling
    • 2008 August 4, “Camp Jean”[1], The Favorite Aunt: Not that it’s a competition:
      A few years ago, my sister and co-aunt Judy started flying [our niece and nephew] Violet and Dash down to California to spend a week with her


  • (sibling's spouse's sister): co-sister-in-law (relative to the married siblings rather than to the children; however, this term generally refers to a different relationship, that of two women who marry brothers)

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