To cause the expulsion of(an embryo or fetus)before it is viable.

胚胎学：研究胚胎和胎儿的形成和发育的学科。

youdao

To cause the expulsion of(an embryo or fetus)before it is viable.

胚胎学：研究胚胎和胎儿的形成和发育的学科。

youdao