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