Rickettsia rickets • rickettsial · · · Info · Definitions · Characters · · Rickettsia · · Text Latin · · Script 10 · · Length Definitions · · · (noun) 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. Synonyms: rickettsia. · · Noun Definition 1 Characters · · R latin capital letter r U+0052 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 k latin small letter k U+006B s latin small letter s U+0073 t latin small letter t U+0074