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Host organism
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The primary eukaryote minus all of its multiple microbiomes
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Host genome
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The entire genetic complement of the primary eukaryotic organism that was obtained by vertical transmission
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Microbiome
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An interacting group of microorganisms that share an ecological niche within the host such as the gut, nasopharynx or the skin [6]
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Nearly all microbiomes are multispecies in character; however, even within a species they tend to be polyclonal in nature [5–8]
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Core genome
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All the genes that each member of a species possesses [4]
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Specifically in bacteria and perhaps other nonsexual haploid organisms (whose reproduction is not dependent on chromosome synapsis and meiosis)
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Distributed genes
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All the genes that are not shared by all strains of a species [4]
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Specifically in bacteria and perhaps other nonsexual haploid organisms (whose reproduction is not dependent on chromosome synapsis and meiosis).
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Supragenome or pangenome
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Core genome plus all of the distributed genes of a species [2, 31]
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Specifically for bacteria and perhaps other nonsexual haploid organisms (whose reproduction is not dependent on chromosome synapsis and meiosis).
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Symbiome
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The organismal ecosystem complete with the eukaryotic host and all of its associated microbiomes
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Hologenome
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The symbiome's genome
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Includes all genes from the host and all symbionts
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