Decidua n. : The inner layer of the wall of the uterus, which envelops the embryo, forms a part of the placenta, and is discharged with it.

Example:
what does Decidua and immature placental tissues means?

Taxonomy
decidua, lining, decidual cells, free encyclopedia, pregnancy, cells, pregnant uterus, endometrial lining, shed, decidua basalis, decidua parietalis, decidua vera, trophoblast, decidualization, leukocytes, hormones, progesterone, layers.

Defination from the web:
decidua is called decidualization, which is a special property of endometrium seen only in hemochorial ... Placenta · Decidua (Decidual cells) · Chorionic villi/Intervillous space · Gestational sac (Amnion/Amniotic sac/Amniotic cavity, Chorion) Histogenesis ...