9 letters · 15 points in Scrabble
noun a chemical used to kill larval pests
originEtymology tree English larva Proto-Indo-European *kh₂eyd-der. Proto-Italic *kaidō Latin caedō Proto-Indo-European *-h₂ Proto-Indo-European *-eh₂ Proto-Italic *-ā Latin -a Latin -cīdader. Middle French -cidebor. English -cide English larvicide From larva + -cide.
Etymology from Wiktionary, CC BY-SA 3.0