The term 'desensitizer' is a six-letter word that refers to a substance or process used to reduce sensitivity to a stimulus. It is commonly used in psychology to refer to a technique used to reduce the emotional response to a traumatic event or to reduce the fear of a particular situation. Desensitization can also be used to reduce the physical pain associated with certain medical procedures. In addition, desensitization is used in the field of dentistry to reduce the pain associated with dental procedures.