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Definition of Rickettsiales
1. Noun. Pleomorphic Gram-negative microorganisms.
Exact synonyms: Order Rickettsiales
Generic synonyms: Animal Order
Group relationships: Division Eubacteria
Member holonyms: Family Rickettsiaceae, Rickettsiaceae, Chlamydiaceae, Family Chlamydiaceae
Generic synonyms: Animal Order
Group relationships: Division Eubacteria
Member holonyms: Family Rickettsiaceae, Rickettsiaceae, Chlamydiaceae, Family Chlamydiaceae
Medical Definition of Rickettsiales
1. An order of gram-negative bacteria including many that may cause disease in man or in other vertebrate or invertebrate hosts. (12 Dec 1998)