Ancestor :: Ancestor (n.) 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..
Ancestor :: Ancestor (n.) An earlier type; a progenitor; as, this fossil animal is regarded as the ancestor of the horse..
Ancestor :: Ancestor (n.) One from whom an estate has descended; -- the correlative of heir.
Cestoidea :: Cestoidea (n. pl.) A class of parasitic worms (Platelminthes) of which the tapeworms are the most common examples. The body is flattened, and usually but not always long, and composed of numerous joints or segments, each of which may contain a complete set of male and female reproductive organs. They have neither mouth nor intestine. See Tapeworm..