nonpermeable
adjEtymology From non- + permeable.
1
Synonym of impermeable.
2
Natural sciences, Physical sciences, Physics Having the same magnetic permeability as that of free space, so that the material in question has a magnetic permeability μ=μ₀ (where μ₀ = 4π×10⁻⁷ N A⁻² exactly in SI units).