| the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus | a garment that covers the head and face |
| that part of the ovary of a flowering plant where the ovules form | a vestment worn by a priest at High Mass in the Roman Catholic Church; a silk shawl |
| | the inner membrane of embryos in higher vertebrates (especially when covering the head at birth) |
| | a membranous covering attached to the immature fruiting body of certain mushrooms |