trophoblast

[ trof-uh-blast, troh-fuh- ]

noun

, Embryology.

1. the layer of extraembryonic ectoderm that chiefly nourishes the embryo or develops into fetal membranes with nutritive functions.

trophoblast

/ ˈtrɒfəˌblæst /

noun

1. the outer layer of cells of the embryo of placental mammals, which is attached to the uterus wall and absorbs nourishment from the uterine fluids

trophoblast

/ trō′fə-blăst′ /

1. The outermost layer of cells of the blastocyst, which attaches the fertilized ovum to the uterine wall and serves as a nutritive pathway for the embryo. The trophoblast eventually differentiates into such tissues as the amnion, the placenta, and the umbilical cord.

Derived Forms

• ˌtrophoˈblastic, adjective

Other Words From

• tropho·blastic adjective

Word History and Origins

Origin of trophoblast¹

First recorded in 1885–90; tropho- + -blast

Word History and Origins

Origin of trophoblast¹

C19: from tropho- + -blast