haemophilus

noun

: any of a genus (Haemophilus) of nonmotile, gram-negative, rod-shaped bacteria that include several important pathogens (such as Haemophilus influenzae associated with meningitis, pneumonia, conjunctivitis, and otitis media)

Note: Haemophili are parasitic on the mucous membranes of humans and other, mainly warm-blooded animals. They prefer aerobic conditions but are also capable of living under anaerobic conditions.

see hib

Examples of haemophilus in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Overall coverage for the primary childhood vaccine series in Michigan, which includes vaccines that prevent measles, mumps, rubella, tetanus, diphtheria, pertussis, haemophilus influenzae, hepatitis, polio, chickenpox and pneumonia, fell to 68.5% in the first quarter of 2022. Kristen Jordan Shamus, Detroit Free Press, 9 Aug. 2022 Shots for rotavirus, pneumococcal infections, haemophilus influenzae type B, bacterial meningitis and hepatitis B declined by 5% to 10%, with human papillomavirus vaccines down by 4%. Erin Alberty, The Salt Lake Tribune, 1 Nov. 2021

Word History

First Known Use

1942, in the meaning defined above

Time Traveler
The first known use of haemophilus was in 1942

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Cite this Entry

“Haemophilus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/haemophilus. Accessed 2 Apr. 2025.

Medical Definition

haemophilus

noun
1
capitalized : a genus of nonmotile, gram-negative, rod-shaped bacteria of the family Pasteurellaceae that include several important pathogens (as H. influenzae associated with meningitis, pneumonia, conjunctivitis, and otitis media and H. ducreyi of chancroid)
2
plural haemophili -lē How to pronounce haemophilus (audio) : any bacterium of the genus Haemophilus

Note: Bacteria of the genus Haemophilus are parasitic on the mucous membranes of humans and other, mainly warm-blooded animals. They prefer aerobic conditions but are also capable of living under anaerobic conditions.

see hib
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