The term 'baby bottle' is composed of two words, 'nurser' and 'VIAL'. A nurser is a container with a nipple used to feed infants and young children. It is usually made of plastic or glass and has a wide neck for easy filling and cleaning. A VIAL is a small container, usually made of glass, used to store liquids or powders. It is often used to store medication or other substances that need to be kept in a sterile environment. Both the nurser and the VIAL are essential components of a baby bottle.