Lineal

adj. of or pertaining to lineage, of descent or ancestry; of a line or lines; made up of lines

Adjective
1. in a straight unbroken line of descent from parent to child; "lineal ancestors"; "lineal heirs"; "a direct descendant of the king"; "direct heredity"
(synonym) direct
(antonym) collateral, indirect
(similar) matrilineal, matrilinear
(see-also) related
2. arranged in a line
(similar) linear, one-dimensional

n. ruler, flat tool used for measuring distances; straightedge, piece of wood or metal with one perfectly straight edge for measuring straightness of other objects or lines

adj. lineal, linear

adj. lineal, of or pertaining to lineage