plural noun, singular enterobacterium [en-tuh-roh-bak-teer-ee-uhm] .
rod-shaped Gram-negative bacteria of the family Enterobacteriaceae, as those of the genera Escherichia, salmonella, and Shigella, occurring normally or pathogenically in the intestines of humans and other animals, and the genus Erwinia, occurring in plants.
Also called enterics.

1950–55; entero- + bacteria

enterobacterial, adjective
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World English Dictionary
enterobacterium (ˌɛntərəʊbækˈtɪərɪəm)
n , pl -ria
any of a class of Gram-negative rodlike bacteria that occur in the gastrointestinal tract

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American Heritage
Medical Dictionary

enterobacterium en·ter·o·bac·ter·i·um (ěn'tə-rō-bāk-tēr'ē-əm)
n. pl. en·ter·o·bac·ter·i·a (-ē-ə)
Any of various gram-negative rod-shaped bacteria of the family Enterobacteriaceae that includes some pathogens of animals, such as the colon bacillus and salmonella.

The American Heritage® Stedman's Medical Dictionary
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