Wiktionary
cyromazine
n. A triazine insect growth regulator used as an insecticide and acaricide.
Wikipedia
Cyromazine
Cyromazine is a triazine insect growth regulator used as an insecticide and an acaricide. It is a cyclopropyl derivative of melamine. Cyromazine works by affecting the nervous system of the immature larval stages of certain insects.
In veterinary medicine, cyromazine is used as an ectoparasiticide.