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May 27, 2012
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Dictionary


py•re•throid



Pronunciation: (pī-rē'throid, -reth'roid), [key]
—n. Chem.
any of several synthetic compounds that are similar to but more persistent than natural pyrethrins.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

pyrethrinpyrethrum
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