microbiome noun2 •A microbial biome, such as the community of microbes within the human gut.The microbiome creates the immediate environment for our genes as they play out their part in disease mechanisms. — 2014 •The genetic information (genomes) of a microbiota.The human microbiota consists of the 10-100 trillion symbiotic microbial cells harbored by each person, primarily bacteria in the gut; the human microbiome consists of the genes these cells harbor. — 2012 formsmicrobiomes