Agnate

Ag·nate

Agnate

a.
  1. Related or akin by the father's side; also, sprung from the same male ancestor; as, agnate brother: a brother having the same father, but a different mother; in ths sense it is a correlative of uterine.
  2. Allied; akin.
    Assume more or less of a fictitious character, but congenial and agnate with the former.

Agnate

n.
  1. A relative whose relationship can be traced exclusively through males. (Civil Law)