Find the word definition

Wiktionary
ectoparasiticide

n. Any pesticide designed to kill parasites that live on the exterior of a host

Wikipedia
Ectoparasiticide

An ectoparasiticide is an antiparasitic drug used in the treatment of ectoparasitic infestations. These drugs are used to kill the parasites that live on the body surface. Permethrin, sulfur, lindane, dicophane, benzyl benzoate, ivermectin and crotamiton are well known ectoparasiticides.