Source : Webster's Revised Unabridged Dictionary (1913)

Decrepitate \De*crep"i*tate\, v. t. [imp. & p. p.
   {Decrepitated}; p. pr. & vb. n. {Decrepitating}.] [Cf. F.
   d['e]cr['e]piter.]
   To roast or calcine so as to cause a crackling noise; as, to
   decrepitate salt.

Decrepitate \De*crep"i*tate\, v. i.
   To crackle, as salt in roasting.

Source : WordNet®

decrepitate
     v 1: undergo decrepitation and crackle; "The salt decrepitated"
     2: to roast or calcine so as to cause to crackle or until
        crackling stops; "decrepitate salts"