Endometrium vs. Decidua: What's the Difference?

Endometrium and Decidua Definitions
Endometrium
The glandular mucous membrane that lines the uterus.
Decidua
A mucous membrane lining the uterus, modified during pregnancy and shed at parturition or during menstruation.
Endometrium
(anatomy) The mucous membrane that lines the uterus in mammals and in which fertilized eggs are implanted.
Decidua
(anatomy) A mucous membrane that lines the uterus and is shed during menstruation and modified during pregnancy
Endometrium
The membrane lining the inner surface of the uterus, or womb.
ADVERTISEMENT
Decidua
The inner layer of the wall of the uterus, which envelops the embryo, forms a part of the placenta, and is discharged with it.
Endometrium
(pregnancy) the mucous membrane that lines the uterus; thickens under hormonal control and (if pregnancy does not occur) is shed in menstruation; if pregnancy occurs it is shed along with the placenta at parturition
Decidua
The epithelial tissue of the endometrium