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Morgan's bacillus

(môrgənz)
n.
  1. A gram-negative aerobic bacterium, Proteus morganii, that occurs in the intestinal tract of humans and is present in normal and diarrheal stools.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.