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methylmercury

[meth-uh l-mur-kyuh-ree]
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noun Chemistry.
  1. any of several extremely toxic organometallic compounds, Hg(CH3)2, formed from metallic mercury by the action of microorganisms and capable of entering the food chain: used as seed disinfectants.
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Origin of methylmercury

First recorded in 1915–20; methyl + mercury
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018