A germfree environment.    From Wordnet, Princeton University. 

Adjective : a germfree laboratory.    From Dictionary.com. 

The atmosphere on Gideon has always been germfree.    From Wordnik.com.  [The Mark Of Gideon] Reference

For example, germfree animals have lower levels of gamma-globulin than do conventional animals with a complete gut flora.    From Wordnik.com.  [Archive 2008-07-01] Reference

This system will be preferent for those who have nutter habit of keeping everything clean and germfree around them.    From Wordnik.com.  [British Blogs] Reference

To mirror the influence of the very first bacterial stimuli on infant IEC, we isolated IEC from mouse foetuses at gestational day 19 and from germfree neonates.    From Wordnik.com.  [BioMed Central - Latest articles] Reference

Patients could select wanted functions easily with the help of the programmable membrane keys or the touch screen-both are easily cleaned with alcohol-to achieve the germfree requirement.    From Wordnik.com.  [Embedded Computing Design] Reference

This position, supported under the P30 mechanism, is designed to attract appropriately trained postdoctoral fellows or junior investigators (no previous tenure track appointment) to explore one or more of the following research areas: (1) interplay of innate/adaptive immune systems and bioflims, possibly using germfree/gnotobiotic models; (2) mucosal vaccinology; or (3) autoimmunity.    From Wordnik.com.  [Naturejobs - All Jobs] Reference