noun. the epithelial tissue of the endometrium.
1. Noun, singular or mass The mucus membrane lining the uterus is known as a decidua once it is implanted with a fertilized egg. 2. Verb, 3rd person singular present Growing best in cool, northern latitudes, the weeping larch (Larix decidua "Pendula") is a uniquely needled conifer that drops its leaves in autumn.