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(Biology) the state of being gnotobiotic
gno•to•bi•o•sis(ˌnoʊ toʊ baɪˈoʊ sɪs)
also gno•to•bi•ot•ics(-ˈɒt ɪks)
the study of organisms or conditions that are free of germs or contaminants or to which a known germ or contaminant has been introduced for purposes of study.