Any female whose sibling has children.
The New Unger’s Bible Dictionary
Nelson’s New Illustrated Bible Dictionary
International Standard Bible Encyclopedia
The Zondervan Encyclopedia of the Bible, Volume 1, A–C
aunt. The Hebrew word (dôdâ H1860, fem. of dôd H1856, “beloved,” “uncle”), derived from terms of endearment used by young children, is used once of a father’s sister (Exod. 6:20) and twice of the wife of a father’s brother (Lev. 18:14; 20:20). The last two passages deal with prohibitions against incest.