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nounthe outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)type of:part of:
Definition that contains chorion
- chorionic of or relating to a chorion
- chorionic villus biopsy a prenatal test to detect birth defects at an early stage of pregnancy; tissue from the chorionic villi is assayed
- molar pregnancy an abnormality during pregnancy; chorionic villi around the fetus degenerate and form clusters of fluid-filled sacs; usually associated with the death of the fetus
- chorioallantois the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
- chorionic villus sampling a prenatal test to detect birth defects at an early stage of pregnancy; tissue from the chorionic villi is assayed
- trophoblastic cancer malignant neoplasm of the uterus derived from the epithelium of the chorion
- chorioallantoic membrane the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
- hydatid mole an abnormality during pregnancy; chorionic villi around the fetus degenerate and form clusters of fluid-filled sacs; usually associated with the death of the fetus
- allantois the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)
- chorionic villus one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta