Lineal
LIN'EAL, adjective [Latin linealis, from linea, line.]
1. Composed of lines; delineated; as lineal designs.
2. In a direct line from an ancestor; as lineal descent; lineal succession.
3. Hereditary; derived from ancestors.
4. Allied by direct descent.
For only you are lineal to the throne.
5. In the direction of a line; as lineal measure.
Lineal measure, the measure of length.