Clinical term for the paraphilic interest in observing unsuspecting people, especially when they are undressing or engaged in sexual activity. Used in psychiatric contexts.
Voyeurism is studied in the field of psychiatry.
Compound of 窃視 (せっし, 'peeping, voyeurism') and 症 (しょう, 'symptom, disorder'). The term is a modern medical coinage, likely calqued from Western psychiatric terminology.