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Meaning of methylmercury

meth•yl•mer•cu•ry

Pronunciation: (meth"ul-mûr'kyu-rē), [key]
— n. Chem.
  1. any of several extremely toxic organometallic compounds, Hg(CH), formed from metallic mercury by the action of microorganisms and capable of entering the food chain: used as seed disinfectants.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.