mulier
Mulier (noun) means (law) A child born to parents after their marriage, as opposed to an older brother or sister born to the same parents before they married.
Etymology
Comes from Middle English mulier(e), moillere, muliery (“adj.: legitimate, both in wedlock; noun: wedlock”), from Anglo-Norman muil(l)eré, moil(l)eré (“legitimate; of legitimate birth”) or Old French moil(l)eré, ultimately from Latin mulier (“woman”).