rickettsia

rickettsia

[ri-ket-see-uh]
noun, plural rickettsiae [ri-ket-see-ee] , rickettsias [ri-ket-see-uhz] .
1.
any member of the genus Rickettsia, comprising rod-shaped to coccoid microorganisms that resemble bacteria but can be as small as a large virus and reproduce only inside a living cell, parasitic in fleas, ticks, lice, and mites and transmitted by bite to vertebrate hosts, including humans, causing such severe diseases as typhus and Rocky Mountain spotted fever.
2.
any rickettsia or rickettsialike microorganism of the orders Rickettsiales and Chlamydiales.

Origin:
1915–20; < Neo-Latin, after Howard T. Ricketts (1871–1910), U.S. pathologist; see -ia

rickettsial, adjective
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World English Dictionary
rickettsia (rɪˈkɛtsɪə)
 
n , pl -siae, -sias
any of a group of parasitic bacteria that live in the tissues of ticks, mites, and other arthropods, and cause disease when transmitted to man and other animals
 
[C20: named after Howard T. Ricketts (1871--1910), US pathologist]
 
rick'ettsial
 
adj

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Etymonline
Word Origin & History

rickettsia
parasitic organism, 1919, named 1916 in Mod.L. by H. da Rocha-Lima in honor of U.S. pathologist H.T. Ricketts (1871-1910), who first identified it in 1909 and died of typhus as a result of his contact with it. The bacteria causes typhus and Rocky Mountain spotted fever, but is unrelated by pathology
or etymology to rickets (q.v.), which is the result of vitamin D deficiency.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

Rickettsia Rick·ett·si·a (rĭ-kět'sē-ə)
n.
A genus of gram-negative bacteria that are carried as parasites by many ticks, fleas, and lice and cause diseases such as typhus, scrub typhus, and Rocky Mountain spotted fever.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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