Source : Webster's Revised Unabridged Dictionary (1913)

Irritative \Ir"ri*ta*tive\, a.
   1. Serving to excite or irritate; irritating; as, an
      irritative agent.

   2. Accompanied with, or produced by, increased action or
      irritation; as, an irritative fever. --E. Darwin.

Source : WordNet®

irritative
     adj : (used of physical stimuli) serving to stimulate or excite;
           "an irritative agent" [syn: {irritating}]