QUACK 1 By N., Pam M.S. - April 28, 2013 A slang term for anyone who represents their ability or training in a health field regarding diagnosis and treatment. Also the description of a practice with no value. QUACK 1: "In the 1800's snake oil salesmen were quacks." Related Psychology Terms SHRINK PSYCHOPATHOLOGY FIGURE-GROUND PERCEPTION PEDIATRIC PSYCHOLOGY GROUP MEDICAL PRACTICE PSYCHOANALYST TRAINER TRAINING SCHOOL ARTEPS EXERCISE STRAIGHT Cite this page: N., Pam M.S., "QUACK 1," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/quack-1/ (accessed January 28, 2020).