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English to English adjective
| 1 |
preventing especially liquids to pass or diffuse through |  | Example: impermeable stone
an impermeable layer of scum
a coat impermeable to rain
source: wordnet30
| 2 |
Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air. | | source: webster1913
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