This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not permeable.

adj. Having the same magnetic permeability as that of free space, so that the material in question has a magnetic permeability (where μ0 = 4π×10−7 N A−2 exactly in SI units).

"A nonpermeable patch containing 2 ml/kg body weight of Margosan-O@ was placed over small shaved areas on a group of albino rabbits."

nonperishable