The Collaborative International Dictionary of English v.0.48:
Insecticide \In*sec"ti*cide\, n. [Insect + L. caedere to kill.] An agent or preparation for destroying insects; an insect powder or spray. -- In*sec"ti*ci`dal, a. [1913 Webster]WordNet (r) 3.0 (2006):
insecticidal adj 1: of or relating to insecticide