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Veillonella

(vā′yə-nĕlə)
n.
  1. A genus of gram-negative bacteria that are parasitic in the mouth and in the intestinal and respiratory tracts.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.