Source : Webster's Revised Unabridged Dictionary (1913)

Alleviatory \Al*le"vi*a*to*ry\, a.
   Alleviative. --Carlyle.

Source : WordNet®

alleviatory
     adj : moderating pain or sorrow by making it easier to bear [syn:
           {alleviative}, {lenitive}, {mitigative}, {mitigatory},
           {palliative}]