ancestry /ˈænsistri/ n. ［c］祖先（集合称）；家庭，血统：be of good ancestry出身名门The two species have developed from a common ancestry.这两个物种都是由同一个祖先繁衍下来的。We can trace our ancestry back to the 16th century.我们的祖先可追溯到16世纪。