1. Outermost layer of cells in the mammalian blastodermic vesicle, which will make contact with the endometrium and take part in establishing the embryo's means of receiving nutrition; the cell layer from which the trophoblast differentiates.
The definition information for trophectoderm is provided by Stedman's. You can search our medical dictionary here.
Stedman's, part of Lippincott Williams & Wilkins, provides a comprehensive line of health-science publications for healthcare professionals and medical students.