The Collaborative International Dictionary of English v.0.48:

patrilineal \patrilineal\ adj.
   tracing descent through the male line; as, a patrilineal
   society.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

patrilineal
    adj 1: based on or tracing descent through the male line; "a
           patrilineal society" [syn: patrilineal, patrilinear]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "patrilineal":
   affiliated, agnate, akin, allied, avuncular, closely related,
   cognate, collateral, congeneric, consanguine, consanguinean,
   consanguineous, distantly related, enate, foster, german, germane,
   kindred, matrilateral, matrilineal, matroclinous, novercal,
   of the blood, patrilateral, patroclinous, related, sib, sibling,
   uterine