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anasarca
Anasazi
Anasazi culture
anastigmat
anastigmatic
anastomose
anastomosis
anastrophe
anastylosis
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ancestor

an·ces·tor [ án sèstər, ánsəstər ] (plural an·ces·tors)


noun 
Definition:
 
1. distant relation somebody is descended from: somebody from whom somebody else is directly descended, especially somebody more distant than a grandparent

2. forerunner: a predecessor of somebody, e.g. in the development of an art form

3. biology earlier species: an animal or plant from which a species has evolved

4. earlier model: a device that was an earlier form of a modern invention or was used as a basis for developing it

[14th century. Via Old French ancestre< Latin antecessor "somebody who goes before" < cess-, past participle of cedere "give way"]
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