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(Chemistry) any of various highly toxic organic compounds of mercury that contain the complex CH3Hg-
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌmɛθ əlˈmɜr kyə ri)

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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Effect of L-NARG on the inhibition of prolactin release by methylmercury
(1) Fish that are low in methylmercury include salmon and canned light tuna.
Methylmercury is commonly found in fish, both freshwater and saltwater.
This study investigated how methylmercury effects Daphnia pulex in the presence of predatory stress chemical.
The study showed the fish in warmer waters ate more but grew less and had higher methylmercury levels in their tissues, suggesting increases in their metabolic rate caused the increased uptake of the toxic metal.
As a naturally occurring element, mercury may be found in water supplies in the form of methylmercury. Natural or man-made sources of mercury contamination of water may occur from volcanoes or burning coal or other pollution.
and tilefish--usually contain the highest amounts of methylmercury. Salmon, pollock, catfish, and shrimp are among the five most widely eaten fish lowest in mercury content.
(2) Mercury contamination, exposures and risks: A new global picture emerges' (ZMWG); Patterns of global seafood mercury concentrations and their relationship with human health' (BRI); An overview of epidemiological evidence on the effects of methylmercury on brain development and a rationale for a lower definition of tolerable exposure' (ZMWG)
Methylmercury can be taken up by aquatic plants and absorbed by insects, worms and other small creatures that live in the sediments.
Food and Drug Administration and the American Academy of Pediatrics calling for the removal of thimerosal in vaccines sold in the United States was made in haste, based on the inaccurate presumption of identical pharmacokinetics of ethylmercury and methylmercury. In the United States and elsewhere in the developed world, multidose vials have been replaced with single-dose vials, which do not require a preservative.
Once deposited, certain microorganisms can transform elemental mercury into methylmercury, a highly toxic form that builds up in fish, shellfish, and animals that eat fish (U.S.
Methylmercury is taken up in the aquatic food chain and fish don't get rid of it as fast as they ingest it.