piperonyl butoxide
noun
pi·per·o·nyl bu·tox·ide
pī-ˈper-ə-ˌnil-byu̇-ˈtäk-ˌsīd
-nᵊl-
: an insecticide C19H30O5
especially
: an oily liquid containing this compound that is used chiefly as a synergist (as for pyrethrin insecticides)
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Merriam-Webster unabridged
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