a combining form meaning “bacteria,” used in the formation of compound words: bactericide; bacteriuria.
Also bacter-, bacterio-.
Origin of bacteri-
< Greek baktḗrion little staff; see bacterium
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.