yersinia pestis yersin • yerth · · · Info · Definitions · Characters · · yersinia pestis · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) a bacillus bacterium that causes the plague; aerosolized bacteria can be used as a bioweapon. Synonyms: Yersinia pestis. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079