a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
Origin of RDX
1940–45; R(esearch) D(epartment) (E)x(plosive), referring to such a department in Woolwich, England
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British Dictionary definitions for rdx
Research Department Explosive; another name for cycloniteSee cyclonite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012