Bacterium
firmicutes
Subclass of:
Bacteria
Definitions related to firmicutes:
  • A phylum of predominantly GRAM-POSITIVE BACTERIA that includes the orders Bacillales and Clostridiales. Firmicutes and BACTEROIDETES are the two bacterial phyla that constitute the majority of the human gut MICROBIOTA.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • A taxonomic phylum within kingdom Bacteria consisting of mostly gram-positive bacteria with a low G+C ratio. The phylum is highly diverse in phenotypic characteristics.
    NCI
    U.S. National Cancer Institute, 2021
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