Mirex meaning

mī'rĕks'
A white odorless crystalline solid, C10 Cl12 , formerly used as an insecticide against ants and as a fire retardant. It was banned in the United States in 1978 because of its effects on the environment and possibly on human health.
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An insecticide consisting of a chlorinated hydrocarbon, C10Cl12, usually mixed with a bait and used esp. against fire ants.
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(organic chemistry) The pesticide and fire retardant perchloropentacyclodecane that is a persistent, bioaccumulative, and toxic pollutant.
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Origin of mirex

Perhaps (pis)mir(e) ex(terminate)