1) Ecology terminology 
Gnotobiosis (Greek for known life) is a condition in which all the forms of life present within an organism can be accounted for. Typically these organisms are germfree or gnotophoric (having only one contaminant). ...
(from the Greek meaning `known life`), condition of life in which only known kinds of organisms are present. Gnotobiotic organisms are of two major ...
gnotobiosis 1. A condition in which animals are sterile both internally and externally, or of the procedures used to secure and maintain these conditions. 2. Growing organisms by themselves or in association with other completely known kinds of organisms; raising gnotobiotic organisms. 3. A condition in which all the forms of life present within ...
an environmental condition in which germfree animals have been inoculated with strains of known microorganisms.