The term "animal bacillus" refers to a group of bacteria that primarily affect animals. These microorganisms can cause various diseases and infections in different animal species. As for synonyms, several alternative terms can be used to describe the same concept. Such synonyms for "animal bacillus" include "zoological bacillus", "faunal bacillus", or simply using the specific name of the bacteria causing the infection or disease. These synonyms can be used interchangeably to refer to the same class of bacteria that impact animals. It is essential to accurately identify and differentiate these bacteria to ensure proper diagnosis and treatment of infections in animals.