释义 |
preimplantation embryo pre·im·plan·ta·tion em·bry·o (prē-implan-tāshŭn embrē-ō) Implantation begins on the seventh day after fertilization; preimplantation is from day 1 to day 6; some clinicians and lawyers use the term "pre-embryo" for this period, implying that the embryo has not formed. |