Of, relating to, or inherited from an ancestor or ancestors; ancestral. In later use specifically: of, relating to, or characteristic of ancestrians.
A member of a group of scientists advocating the explanation of heredity by mathematical calculation of the contributions of successive generations of ancestors.
The most prominent members of this group included Francis Galton, Karl Pearson, and Raphael Weldon.
Mid 18th century; earliest use found in The Gentleman's Magazine. From ancestry + -an.