Medical Definition of haemophilus
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)
2plural haemophili \-lē\play : any bacterium of the genus Haemophilus ◆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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