PLAQUE By N., Sam M.S. - 8 noun. a minor patch or area of irregular tissue which generally has a unique appearance from the surrounding normal tissue. PLAQUE: "The plaque is normal in Lori's case since we already know she has multiple sclerosis." Related Psychology Terms DEMYELINATING DISORDERS Ethics and Legal Course: Landmark Legal Case SEXUAL DEVIATIONS (GENERAL) BRAIN DISORDERS The Anatomy of Research and the Scientific Method Dissociative Identity Disorder BRAIN WAVES (Electroencephalogram, EEG) VISIBILITY CURVE CLINICAL PSYCHOLOGY BRAIN TUMOR DISORDERS Cite this page: N., Sam M.S., "PLAQUE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/plaque/ (accessed February 6, 2023).