methylation

[meth-uh-ley-shuhn]
noun Chemistry.
the process of replacing a hydrogen atom with a methyl group.

Origin:
1875–80; methylate + -ion

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World English Dictionary
methylate (ˈmɛθɪˌleɪt)
 
vb
1.  (tr) to mix with methanol
2.  to undergo or cause to undergo a chemical reaction in which a methyl group is introduced into a molecule
 
n
3.  another name for methoxide
 
methyl'ation
 
n
 
'methylator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Methylation typically silences genes so that they are not expressed.
But when something goes awry, methylation can unleash a tumor by silencing a gene that normally keeps cell growth in check.
Methylation turns off certain sections of genetic code.
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