lar·vi·cide I. noun alsolar·va·cide\ˈlärvəˌsīd\ (-s) Etymology:larvi- or larva + -cide : an insecticide or other pesticide used for killing larvae — compare adulticide II. transitive verb (-ed/-ing/-s) : to treat with a larvicide < effects of DDT mosquito larviciding on wildlife — Public Health Reports >