Definition of "microbiome"

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 August, “Defining the Human Microbiome”, in Nutrition Reviews‎, volume 70, number Suppl. 1, pages S38–S44

Your body’s microbiome is all the genes your microbiota contains, however colloquially the two terms are often used interchangeably.

2018 March 26, Nicola Davis, “The human microbiome: why our microbes could be key to our health”, in The Guardian‎

Mostly, the microbiome is beneficial. It helps with digestion and enables people to extract a lot more calories from their food than would otherwise be possible. Research over the past few years, however, has implicated it in diseases from atherosclerosis to asthma to autism.

2013 June 29, “A punch in the gut”, in The Economist‎, volume 407, number 8842, pages 72–3

The microbiome creates the immediate environment for our genes as they play out their part in disease mechanisms.

2014 June 30, Wayne Koberstein, “Second Genome”, in Life Science Leader‎, volume 6, number 7, page 14

For your community of microbes— your 'microbiome' — your body is a planet.

2020, Merlin Sheldrake, Entangled Life, page 18