1. One from whom a person is descended, whether on the father's or mother's side, at any distance of time; a progenitor; a fore father.
2. Biol. An earlier type; a progenitor; as, this fossil animal is regarded as the ancestor of the horse.
3. Law One from whom an estate has descended; -- the correlative of heir.
n : someone from whom you are descended (but usually more remote
than a grandparent) [syn: ascendant, ascendent, antecedent,
root] [ant: descendant]