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Richmond-upon-Thames
Richter scale
ricin
ricinoleic acid
ricinuleid
rick (1)
rick (2)
rickets
rickettsia
rickettsial pox
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rickettsia

rick·ett·si·a [ ri kétsee ə ] (plural rick·ett·si·as or rick·ett·si·ae [ ri kétsee  ] or rick·ett·si·a)


noun 
Definition:
 
parasitic bacterium causing disease: a parasitic bacterium that typically lives inside ticks and can be transmitted to humans, causing Rocky Mountain spotted fever, forms of typhus, and other diseases. Order Rickettsiales.

[Early 20th century. < modern Latin, after H. T. Ricketts (1871-1910), U.S. pathologist]

rick·ett·si·al adjective
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