Source : Webster's Revised Unabridged Dictionary (1913)

Crepitation \Crep`i*ta"tion\ (kr?p`?-t?"sh?n), n. [Cf. F.
   cr['e]pitation.]
   1. The act of crepitating or crackling.

   2. (Med.)
      (a) A grating or crackling sensation or sound, as that
          produced by rubbing two fragments of a broken bone
          together, or by pressing upon cellular tissue
          containing air.
      (b) A crepitant r[^a]le.

Source : WordNet®

crepitation
     n : the sharp sound of snapping noises [syn: {crackle}, {crackling}]