radix
n.— «In his letters home to his younger brother, he talks about “radix,” slang for the authorities or police, and about the “bull boy” guards “giving it large,” a reference to threats and the use of violence.» —“‘Coded Letters’ Reveal Briton’s Suffering In Guantanamo” in Cairo IslamOnline.net (Doha, Qatar) Aug. 8, 2004. (source: Double-Tongued Dictionary)