ad-neptis, richtiger atneptis, is, f., die Ururgroßenkelin, ICt.
http://www.zeno.org/Georges-1913. 1806–1895.
adneptis — /aedneptas/ The daughter of a great greatgranddaughter … Black's law dictionary
adneptis — The daughter of a great great granddaughter … Ballentine's law dictionary