| (used as a nonsense word by children to express approval or to represent the longest word in English.) |
| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |
counterespionage
espionage directed toward detecting and thwarting enemy espionage. See intelligence (in government operations)
Learn more about counterespionage with a free trial on Britannica.com.