The term 'OUTER LAYER OF THE SKIN' can be summarized as the EPIDERMIS, which is a nine-letter word. The EPIDERMIS is the outermost layer of the skin and is composed of stratified squamous epithelium. It serves as a protective barrier against environmental factors such as bacteria, viruses, and other pathogens. It also helps to regulate body temperature and prevent water loss. The EPIDERMIS is constantly regenerating itself and is made up of four distinct layers: the stratum corneum, stratum lucidum, stratum granulosum, and stratum basale.