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
Indulge Your Inner Word Nerd
1964
First Known Use of c–4
1964
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