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| a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S. |
| (used as a nonsense word by children to express approval or to represent the longest word in English.) |
psychopathology psy·cho·pa·thol·o·gy (sī'kō-pə-thŏl'ə-jē, -pā-)
n.
The study of the origin, development, and manifestations of mental or behavioral disorders.