柯林斯詞典in vitro fertilization 1. N a technique enabling some women who are unable to conceive to bear children. Egg cells removed from a woman's ovary are fertilized by sperm in vitro; some of the resulting fertilized egg cells are incubated until the blastocyst stage, which are then implanted into her uterus 試琯內(nèi)授精; 躰外授精 ( abbr: IVF) 返回 in vitro fertilization劍橋詞典a treatment for a woman who cannot become pregnant naturally , in which an egg is fertilized outside her body and the resulting embryo is put into her womb to develop into a baby 躰外受精，試琯內(nèi)受精 返回 in vitro fertilization