gnotobiology
(nō′tō-bī-ŏl′ə-jē)- The study of organisms or conditions that are either free of germs or associated only with known or specified germs.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.