Source : Webster's Revised Unabridged Dictionary (1913)

Putrescence \Pu*tres"cence\, n.
   The state of being putrescent; putrescent matter.

Source : WordNet®

putrescence
     n 1: in a state of progressive putrefaction [syn: {putridness}, {rottenness},
           {corruption}]
     2: the quality of rotting and becoming putrid [syn: {rottenness}]