Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A gram-negative bacillus of the genus Yersinia that causes various diseases in animals and humans, including plague.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A Gram-negative bacterium, of the genus Yersinia, that is an etiological agent of several diseases in animals and humans. Notably Yersinia pestis, which causes bubonic plague.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From New Latin Yersinia, genus name, after Alexandre Émile Jean Yersin, (1863–1943), Swiss-born French bacteriologist.]

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