Adjective
hemimethylated (comparative more hemimethylated, superlative most hemimethylated)
(genetics, of a strand) Discordant in methylation; partially methylated.
Because E. coli methylates GATC DNA sequences, DNA synthesis results in hemimethylated sequences. Source: Internet
If this enzyme reaches a "hemimethylated" portion of DNA (where 5-methylcytosine is in only one of the two DNA strands) the enzyme will methylate the other half. Source: Internet