heir pre·sump·tive
noun/ˌeə prɪˈzʌmptɪv/
/ˌer prɪˈzʌmptɪv/
(plural heirs presumptive)
- an heir who may lose his or her legal right to receive somebody’s property, money or title if somebody with a stronger claim is born
假定继承人（其继承权会因有血统更近的继承人出生而丧失）