decidua

< /dɪˈsɪdʒ uˌi/. Embryology.

1. the endometrium of a pregnant uterus that in many of the higher mammals is cast off at parturition.

noun plural -ciduas or -ciduae (-ˈsɪdjʊˌiː)

1. the specialized mucous membrane that lines the uterus of some mammals during pregnancy: is shed, with the placenta, at parturition

n. pl. de•cid•u•as

1. A mucous membrane lining the uterus, modified during pregnancy and shed at parturition or during menstruation.deciduous membrane