patruus

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
PATRUUS, civil law. An uncle by the father's side, a father's brother. Dig. 
38, 10, 10, Patruus magnus, is a grandfather's brother, grand uncle. Patruus 
major, is a great-grandfather's brother. Patruus maximus, is a, great-
grandfather's father's brother. 
    

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