Avunculus
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In the civil law. A mother's brother.
2 Bl. Comm. 230.
Avunculus magnus, a great-uncle. Avunculus major, a great-grandmother's brother. Avunculus maximum, a great-great-grandmother's brother.
See Dig. 38, 10, 10; Inst. 3, 6, 2.