单词heir presumptive
v.: 继承网络: 假定继承人；假定继承人选；推定继承人
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）:
an heir who may lose his or her legal right to receive sb"s property, money or title if sb with a stronger claim is born
【法律】假定继承人〔虽有继承权但其继承权可因近亲之出生而消失的人〕