impermeable

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impermeable

(of a substance) not allowing the passage of a fluid through interstices; not permeable

Impermeable

Resistance to penetration by fluids or vapor through the material.

impermeable

[im′pər·mē·ə·bəl]
(science and technology)
Not permitting water or other fluid to pass through. Also known as impervious.

impermeable

Said of a soil whose particles are so closely spaced that the passage of water is either prevented or very slow.