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\ ˌpē-ˌē-ˌtē-ˈen 
\
\Definition of PETN
: a crystalline ester C5H8N4O12 used as a powerful high explosive and medically in the treatment of angina pectoris … the experts determined that its explosive content was identical to that of the Honolulu bomb—PETN, an explosive undetectable by X-ray.— Steven Emerson
— called also pentaerythritol tetranitrate
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The first known use of PETN was in 1944
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