The Collaborative International Dictionary of English v.0.48:

Detonate \Det"o*nate\, v. i. [imp. & p. p. Detonated; p. pr. &
   vb. n. Detonating.] [L. detonare, v. i., to thunder down;
   de + tonare to thunder; akin to E. thunder. See Thunder,
   and cf. Detonize.]
   To explode with a sudden report; as, niter detonates with
   sulphur.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Detonating \Det"o*na`ting\, a. & n.
   from Detonate.
   [1913 Webster]

   Detonating gas, a mixture of two volumes of hydrogen with
      one volume of oxygen, which explodes with a loud report
      upon ignition.

   Detonating powder, any powder or solid substance, as
      fulminate of mercury, which when struck, explodes with
      violence and a loud report.

   Detonating primer, a primer exploded by a fuse; -- used to
      explode gun cotton in blasting operations.

   Detonating tube, a strong tube of glass, usually graduated,
      closed at one end, and furnished with two wires passing
      through its sides at opposite points, and nearly meeting,
      for the purpose of exploding gaseous mixtures by an
      electric spark, as in gas analysis, etc.
      [1913 Webster]