of, belonging to, inherited from, or denoting an ancestor or ancestors 祖先的;祖传的 the family's ancestral home. 这一家族的祖籍。 the only records of the ancestral forms are their fossils. 惟一可以记录它们祖先样子的是化石。
派生 ancestrally adverb 语源
late Middle English : from Old French ancestrel, from ancestre (see ancestor)