Yes the answer by Philip is correct in this instance in regard to aircraft interiors, although in aircraft maintenance terminology, it usually refers to a pressure bulkhead, such as either side of the wheel wells, or at either end of the fuselage, such as between the cabin and the tail section.
Rainbow baby. A rainbow baby is a baby that is born following a miscarriage or still birth. In the real world, a beautiful and bright rainbow follows a storm and gives hope of things getting better. The rainbow is more appreciated having just experienced the storm in comparison. The storm (pregnancy loss) has already happened and nothing can change that experience. Storm-clouds might still be overhead as the family continue to cope with the loss, but something colourful and bright has emerged from the darkness and misery.
Rainbow. A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere, resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc.