Permethrin
noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 A synthetic insecticide, C₂₁H₂₀Cl₂O₃, used to treat head lice, nits, and scabies; as an active ingredient in flea collars; and to eradicate woodworm infestations. countable, uncountable
Etymology
From Latin perme(ō) (“to pervade”) + -thrin.