epi·ge·no·mics | \ˌe-pə-ji-ˈnō-miks, -ˈnä-\

Definition of epigenomics 

: a branch of genomics concerned with the epigenetic changes that modify the expression and function of the genetic material of an organism : the study of the epigenome Until now, researchers have tackled epigenomics piecemeal, with different groups cataloging where on the genomes of particular cells certain epigenetic modifications occur.— Elizabeth Pennisi

First Known Use of epigenomics

1997, in the meaning defined above

History and Etymology for epigenomics

epi- + genomics, after epigenetic

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The first known use of epigenomics was in 1997

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