Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An alkylation process involving addition of, or substitution by, a methyl group.
  • noun The process of treating something with methyl alcohol.

from The Century Dictionary.

  • noun The act of methylating. See methylate.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry the addition of a methyl group to a molecule
  • noun genetics the addition of a methyl group to cytosine and adenine residues in DNA that leads to the epigenetic modification of DNA and the reduction of gene expression and protein production

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

methyl + -ation

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