A bacillus bacterium that causes the plague; aerosolized bacteria can be used as a bioweapon WordNet 3.0 & Open English WordNet

Yersinia pestis is a gram-negative, non-motile, coccobacillus bacterium without spores that is related to both Yersinia enterocolitica and Yersinia pseudotuberculosis, the pathogen from which Y. pestis evolved and responsible for the Far East scarlet-like fever. Wikipedia

A Gram-negative rod-shaped bacterium species Wikipedia Disambiguation

Species of bacteria, cause of plague Wikidata