foremother

/ˈfɔːrmʌðər/
noun
  1. A woman from the past who is an ancestor or a pioneer in a particular field.
    • The suffragettes are considered foremothers of the women's rights movement.
    • Marie Curie is a scientific foremother to many female researchers today.
    • She traced her family tree and found a foremother who came to America in the 1700s.