The Collaborative International Dictionary of English v.0.48:

Explosive \Ex*plo"sive\, n.
   1. An explosive agent; a compound or mixture susceptible of a
      rapid chemical reaction, as gunpowder, TNT,
      dynamite, or nitro-glycerine.
      [1913 Webster +PJC]

   2. A sound produced by an explosive impulse of the breath;
      (Phonetics) one of consonants p, b, t, d, k, g, which are
      sounded with a sort of explosive power of voice.

   Note: [See Guide to Pronunciation, [root] 155-7, 184.]
         [1913 Webster]

WordNet (r) 3.0 (2006):

TNT
    n 1: explosive consisting of a yellow crystalline compound that
         is a flammable toxic derivative of toluene [syn: TNT,
         trinitrotoluene]