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1. (n.) rickettsia
any of various rod-shaped infectious microorganisms of the heterogeneous group Rickettsieae, formerly classified with the bacteria but markedly smaller and reproducing only inside a living cell: parasitic in fleas, ticks, mites, or lice and transmitted by bite.
Etymology: (< NL (1916), after Howard T. Ricketts (1871–1910), U.S. pathologist; see -ia)
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| Definition of 'rickettsia' |
Princeton's WordNet |
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1. (noun) rickettsia
any of a group of very small rod-shaped bacteria that live in biting arthropods (as ticks and mites) and cause disease in vertebrate hosts; they cause typhus and other febrile diseases in human beings
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| Definition of 'rickettsia' |
U.S. National Library of Medicine |
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1. rickettsia
A genus of gram-negative, aerobic, rod-shaped bacteria often surrounded by a protein microcapsular layer and slime layer. The natural cycle of its organisms generally involves a vertebrate and an invertebrate host. Species of the genus are the etiological agents of human diseases, such as typhus.
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Definitions of rickettsia 
