noun plural

Rick·​ett·​si·​a·​les ri-ˌket-sē-ˈā-(ˌ)lēz How to pronounce Rickettsiales (audio)
: an order of small pleomorphic gram-negative bacteria that are obligate parasites living in vertebrates or in arthropods which often serve as vectors of those parasitic in vertebrates and are placed in the families Anaplasmataceae, Bartonellaceae, and Rickettsiaceae

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Cite this Entry

“Rickettsiales.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Rickettsiales. Accessed 16 Jul. 2024.

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