: an organochlorine insecticide C10Cl12 formerly used especially against ants

Word History

Etymology

origin unknown

First Known Use

1962, in the meaning defined above

Time Traveler
The first known use of mirex was in 1962

Browse Nearby Words

Cite this Entry

“Mirex.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mirex. Accessed 7 Jul. 2026.

Medical Definition

: an organochlorine insecticide C10Cl12 formerly used especially against ants that is a suspected carcinogen
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