The Collaborative International Dictionary of English v.0.48:
Agnatic \Ag*nat"ic\, a. [Cf. F. agnatique.] Pertaining to descent by the male line of ancestors. "The agnatic succession." --Blackstone. [1913 Webster]WordNet (r) 3.0 (2006):
agnatic adj 1: related on the father's side; "a paternal aunt" [syn: agnate, agnatic, paternal]