[ ep-i-jee-nohm ]
/ ˌɛp ɪˈdʒi noʊm /
Genetics. a network of chemical compounds surrounding DNA that modify the genome without altering the DNA sequences and have a role in determining which genes are active in a particular cell.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019