The Collaborative International Dictionary
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.
Wiktionary
a. Of, relating to, or being insecticide; insect-killing.
Wikipedia
Insecticidal is a 2005 horror movie featuring giant killer insects. In the film, a college student performs experiments on insects until a housemate tries to kill them. The insects grow to huge sizes and turn the sorority house into a nest, trying to kill the residents.
Usage examples of "insecticidal".
Using these shampoos and then making the effort to go through the hair with a special comb designed to remove lice and nits can be just as effective as using an insecticidal shampoo - and a lot safer.
Ayla was nervous as she raced to dig up soaproot, horsetail fern, and red-rooted pigweed, and her stomach was a bundle of knots while she waited anxiously for boiling water from one of the cooking fires to extract the insecticidal element from the fern.
Camphor, which comes from the camphor tree, has been used in the past for medicinal purposes, and it is reputed to have both repellent and insecticidal properties.
To treat whiteflies, use an insecticidal soap at five day intervals or spray with a solution of four parts water to three parts rubbing alcohol -- add a squirt of dish soap for good measure -- and keep the plant out of the light until the alcohol dries completely.
Bacot, Entomologist to the Lister Institute of Preventive Medicine, in the British Medical Journal of September 30, 1916, the writer records the results of experiments with various reputedly insecticidal substances, but mainly with Cytisine, the alkaloid obtained from the seeds of the Gorse and Laburnum, the physiological properties of which resemble those of Nicotine.