Eubacterium is a type of bacteria that can be found in different environments. It is a gram-positive bacterium that exists as a single cell or in chains, and it is anaerobic. There are several synonyms for eubacterium, such as Eubacteria, Eubacteriales, Eubacterium spp, and Eubacterales. These synonyms all refer to the same type of bacteria but using different names. Eubacteria is the term for all bacteria except for the Archaebacteria, which have a distinct morphology and biochemistry. Eubacteriales and Eubacterales are orders of bacteria, whereas Eubacterium spp is a collection of various species of Eubacterium. Understanding these synonyms for the word "eubacterium" helps in identifying this type of bacteria and studying the different characteristics it has.