gnotobiology

[ nō′tō-bī-ŏlə-jē ]

n.

The study of organisms or conditions that are either free of germs or associated only with known or specified germs.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.