Meaning of “ancestor” in the English Dictionary

"ancestor" in British English

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ancestornoun [ C ]

uk /ˈæər/ us /ˈæɚ/

B2 a person related to you who lived a long time ago:

There were portraits of his ancestors on the walls of the room.

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.

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adjective [ before noun ] uk /ænˈses.trəl/ us /ænˈses.trəl/

an ancestral home
ancestral rights

(Definition of “ancestor” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ancestor" in American English

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ancestornoun [ C ]

us /ˈænˌses·tər, -səs-/

any member of your family from long ago, for example, the grandparents of your grandparents:

He returned to Ecuador, where his mother’s ancestors lived.
adjective [ not gradable ] us /ænˈses·trəl/

He wanted to tour his family's ancestral homeland, Germany.
noun [ C usually sing ] us /ˈænˌses·tri, -səs-/

She was of Spanish and Iroquois ancestry.

(Definition of “ancestor” from the Cambridge Academic Content Dictionary © Cambridge University Press)