Definitions for semtexˈsɛm tɛks
Random House Webster's College Dictionary
a plastic explosive that is easily tractable and largely odorless, used esp. by terrorists.
Category: Military, Government
Origin of Semtex:
1980–85; name given by manufacturer; prob. from Semtín, town in Czech Republic where made +ex(plosive)
A highly malleable general purpose plastic explosive
Origin: Genericized trademark Semtex, which was formed by combining the name Semtín (a suburb of Pardubice where the manufacturer is located) with explosive.