Definition of piperonyl in English:
piperonyl
noun pɪˈpɛrənɪlpɪˈpɛrənʌɪl
Chemistry The radical or group (OCH₂O)H₃C₆—CH₂—, derived from piperonal. Usually attributive.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society. From piperon- + -yl.