Meaning of piperonyl butoxide

pi•per'o•nyl butox'ide

Pronunciation: (pi-per'u-nl, pī-, pip'ur-u-nil), [key]
— Chem. Chem.
  1. a light-brown liquid, CHO, used chiefly as a synergist in certain insecticides.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.