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\ ˈsē-ˈfȯr 
\
\Definition of C-4
: a high explosive composed of various chemicals that make it moldable and plastic
Before it was detonated, I held a piece of C-4 plastic explosive about the size of a baseball. It felt slightly greasy and granular, but otherwise indistinguishable from my daughter's Play-Doh.— Eric Schlosser
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Time Traveler for C-4
The first known use of C-4 was in 1964
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