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de·meth·yl·a·tion (.)dē-.me-thə-'lā-shən n the process of removing a methyl group from a chemical compound
de·meth·yl·ate (')dē-'me-thə-.lāt vt, -at·ed; -at·ing
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de·meth·yl·a·tion (de-meth″əl-aґshən) the removal of a methyl group,
CH3, from a compound.
Medical dictionary. 2011.