Matertera Major
Defined in 2 dictionaries — Bouvier (1914), Black's (1910)
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
A great-grandmother’s sister.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A greater aunt; a great-grandmother's sister, (proavice soror;) a father's or mother's great-aunt, (patris vel matris matertera magna.) Dig. 38, 10, 10, 16.
Defined under Matertera in Black's Law Dictionary.