from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various bacteria of the genus Rickettsia, carried as parasites by many ticks, fleas, and lice, that cause diseases such as typhus, scrub typhus, and Rocky Mountain spotted fever in humans.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a group of gram-negative bacteria, of the genus Rickettsia, carried as parasites by ticks, fleas and lice; they cause typhus and other diseases
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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
New Latin Rickettsia, genus name, after Howard Taylor Ricketts (1871-1910), American pathologist.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Rickettsia (genus name) (Wiktionary)