germfree

or germ-free

[ jurm-free, -free ]
/ ˈdʒɜrmˈfri, -ˌfri /

adjective

free of germs; sterile: This kind of research should be done in a germfree laboratory.
(of experimental animals) born and raised under sterile conditions.

Origin of germfree

First recorded in 1930–35; germ + -free