Definition of semtex noun from the Oxford Advanced Learner's Dictionary

 

semtex

 noun
noun
BrE BrE//ˈsemteks//
 
; NAmE NAmE//ˈsemteks//
 
[uncountable]
 
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a powerful explosive that is used for making bombs, often illegally Word Origin 1980s: probably a blend of Semtin (the name of a village in the Czech Republic near the place of production) and explosive.
See the Oxford Advanced American Dictionary entry: semtex