祖先

zǔxiān
  1. ancestors; forebears
  2. (biology) ancestral species; ancient species from which present-day species evolved

CEDICT

biology

Entry Composition

1 祖 zǔ
  1. ancestor
  2. forefather
  3. grandparents
2 先 xiān
  1. beforehand; first; earlier
  2. at first; originally
  3. for the time being; for now
  4. (prefix) my late (in referring to deceased relatives older than oneself)