Source : Webster's Revised Unabridged Dictionary (1913)

Sternutatory \Ster*nu"ta*to*ry\, a.
   Sternutative. -- n. A sternutatory substance or medicine.

Source : WordNet®

sternutatory
     adj 1: tending to cause sneezing
     2: causing sneezing; "pepper is a sternutatory substance" [syn:
         {sternutative}]
     n : a chemical substance that causes sneezing and coughing and
         crying; "police used a sternutatory to subdue the mob"
         [syn: {sternutator}]