You searched for: “lineal
lineal (adjective) (not comparable)
1. Concerning the direct line of descent from an ancestor: Kevin's lineal heritage to the property was through his mother's side of the family.
2. Consisting of lines; delineated: Harry's piece of artwork depicted a tree only made with vertical and lineal marks using ink and pen.
This entry is located in the following units: -al; -ial, -eal (page 18) lino-, lin-, line- (page 1)
linear, lineal
linear (LIN ee uhr) (adjective)
Relating to a direct route: The road proceeded in a linear manner, straight across the desert.
lineal (LIN ee uhl) (adjective)
Concerning the direct line of descent from an ancestor: Kevin's lineal heritage to the property was through his mother's side of the family.

Brian can trace his lineage in an uninterrupted linear fashion; following the direct lineal line of descent from his father's ancestors.