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Meaning of transmethylation

trans•meth•yl•a•tion

Pronunciation: (trans"meth-u-lā'shun, tranz"-), [key]
— n. Chem.
  1. the transfer of a methyl group from one compound to another.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.