piperonyl but oxide

piperonyl butoxide

[pi-per-uh-nl, pahy-, pip-er-uh-nil]
noun Chemistry.
a light-brown liquid, C 1 9 H 3 0 O 5 , used chiefly as a synergist in certain insecticides.

Origin:
1940–45; piperon(al) + -yl; but- (from butyric) + oxide

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