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piperonyl butoxide

[pi-per-uh-nl, pahy-, pip-er-uh-nil] /pɪˈpɛr ə nl, paɪ-, ˈpɪp ər ə nɪl/
noun, Chemistry
1.
a light-brown liquid, C 1 9 H 3 0 O 5 , used chiefly as a synergist in certain insecticides.
Origin
1940-1945
1940-45; piperon(al) + -yl; but- (from butyric) + oxide
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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