ˈpen.trə̇l noun
( -s )
Etymology: penta- + -ryl (as in tetryl )
: an explosive C 8 H 6 (NO 2 ) 4 ONO 2 that is derived from nitramide, picric acid, and ethyl nitrate and that is somewhat more sensitive to friction than tetryl and much more sensitive than picric acid or trinitrotoluene