The Collaborative International Dictionary of English v.0.48:
Irritative \Ir"ri*ta*tive\, a. 1. Serving to excite or irritate; irritating; as, an irritative agent. [1913 Webster] 2. Accompanied with, or produced by, increased action or irritation; as, an irritative fever. --E. Darwin. [1913 Webster]WordNet (r) 3.0 (2006):
irritative adj 1: (used of physical stimuli) serving to stimulate or excite; "an irritative agent" [syn: irritating, irritative]