great-grandmother
noun [ C ] uk/ˌɡreɪtˈɡræn.mʌð.ər/ us/ˌɡreɪtˈɡræm.mʌð.ər/
曾祖母;曾外祖母
the grandmother of one of your parents
He began to research his maternal family, starting with his great-grandmother. 他开始研究自己母亲这边的亲人,从曾外祖母开始。
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