IPA: /ˈroʊdəntɪˌsaɪd/
KK: /ˈroʊdəntɪˌsaɪd/
A chemical that is used to kill or control rodents, such as rats and mice.
Farmers often use rodenticide to protect their crops from being damaged by rodents.
Rodenticide is formed from "rodent" (from Latin *rodere*, meaning to gnaw) and "-cide" (from Latin *caedere*, meaning to kill). The word refers to a substance used to kill rodents, specifically those that gnaw.
Think of 'gnawing' ('rodent') and 'killing' ('-cide') to remember that rodenticide is something that kills gnawing animals.