Rackarock

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Rackarock \Rack"a*rock`\ (r[a^]k"[.a]*r[o^]k`), n. [Rack to
     stretch, strain + a + rock.]
     A Sprengel explosive consisting of potassium chlorate and
     mono-nitrobenzene.
     [Webster 1913 Suppl.]