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English definition of “ancestor”

ancestor

noun [C] uk   /ˈæn.ses.tər/ us    /-tɚ/
B2 a person related to you who lived a long time ago: There were portraits of his ancestors on the walls of the room.
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Ancestors and descendants
a plant, animal, or object that is related to one existing at a later point in time: This wooden instrument is the ancestor of the modern metal flute.Ancestors and descendants
ancestral
adjective [before noun] uk   /ænˈses.trəl/ us  
an ancestral home ancestral rightsAncestors and descendants
(Definition of ancestor from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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