adj. & n.
--adj.
1. descended esp. by male line from the same male ancestor (cf. COGNATE).
2 descended from the same forefather; of the same clan or nation.
3 of the same nature; akin.
--n. one who is descended esp. by male line from the same male ancestor.
Derivatives:
agnatic adj. agnation n.
Etymology: L agnatus f. ad to + gnasci be born f. stem gen- beget