a white, crystalline, water-insoluble, powerful high explosive, C 3 H 6 N 6 O 6 , used chiefly in bombs and shells.

1940–45; R(esearch) D(epartment) (E)x(plosive), referring to such a department in Woolwich, England

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abbreviation for
See cyclonite Research Department Explosive; another name for cyclonite

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for RDX
Rdx, sublimate in vacuum, which limits their usefulness in aerospace applications.
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