Germ-free means having no germs left on it. A germ-free surface, keep it germ-free, germ-free conditions.
Nothing outside a laboratory really is, and the claim on a household product means a large reduction rather than none at all. Truly germ-free animals are bred in isolators for research and are strange creatures.
1adjectivegerm-freeHaving no germs left on it.
“The operating theatre must be kept germ-free at all times.”
germ-free is a quality.
Germ plus free, with germ from Latin germen, a sprout or seed.
Proto-Indo-European
*ǵenh₁-
Latin
germen — bud, seed, embryo
Middle French
germe
English
germ
English, today
germ-free
From germ + free. germ comes from Middle French germe, from Latin germen (“bud, seed, embryo”). a doublet of germen.
Etymology from Wiktionary, CC BY-SA