ag·nate 
(ăgnāt′)
(ăgnāt′)adj.
1. Related on or descended from the father's or male side.
2. Coming from a common source; akin.
n.
A relative on the father's or male side only.
[Latin agnātus, past participle of agnāscī, to become an agnate : ad-, ad- + nāscī, to be born; see genə- in the Appendix of Indo-European roots.]
ag·natic (ăg-nătĭk) adj.
ag·nati·cal·ly adv.
ag·nation n.