noun Chemistry.
any of several extremely toxic organometallic compounds, Hg(CH 3 ) 2 , formed from metallic mercury by the action of microorganisms and capable of entering the food chain: used as seed disinfectants.

1915–20; methyl + mercury Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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It's no surprise that a chemical as potent as methylmercury harms wildlife when it enters an ecosystem in high concentration.
Once methylmercury enters streams, it is available for uptake at the base of the food web.
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