n 1  cap  :  a genus of small flexible spirochetes of the family Spirochaetaceae that are parasites of humans and warm-blooded animals and include the causative agents of septicemia in chickens (B. recurrentis), relapsing fever in Africa (B. duttoni), and Lyme disease in the U.S. (B. burgdorferi)  2  :  a spirochete of the genus Borrelia .
 
   
 
Similar sounding terms:  ba·ri·lla  bar·ley  Beer's law  braille 
 
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