NCIt definition : A solution or suspension composed of an anionic surfactant and intended for administration
to the hair and/or scalp.;
Alternative definition : CDISC: A liquid soap or detergent used to clean the hair and scalp and is often used
as a vehicle for dermatologic agents. (NCI); EDQM-HC: Liquid or, occasionally, semi-solid, usually multidose preparation intended
for application to the scalp by rubbing and subsequent washing away with water. Upon
rubbing with water, shampoos usually form foam. Shampoos are solutions, suspensions
or emulsions containing surface-active agents.;