| 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.) |
materia medica materia med·i·ca (měd'ĭ-kə)
n.
The branch of medical science that deals with the origin, preparation, dosage, and administration of drugs.