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tting passage; capable of being penetrated by another body or substance; permeable; as, a pervious soil. [Doors] . . . pervious to winds, and open every way. Pope.

The quality or state of being pervious; as, the perviousness of glass. Boyle.

Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air. This gulf impassable, impervious. Milton. The minds of these zealots were absolutely impervious. Macaulay.

Not pervious to heat.

To render impervious to sound, as a partition or floor, by filling the space within with mortar, by lining with paper, etc.

The act or process of rendering impervious to sound, as a floor or wall; also, the material with which the spaces are filled in this process; pugging.

So tightly fitted as to preclude the escape of gas; impervious to gas.

e liver; a state of the lungs when gorged with effused matter, so that they are no longer pervious to the air.

ng penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield. Highest woods impenetrable To star or sunlight. Milton.

In an impenetrable manner or state; imperviously. "Impenetrably armed." Milton. "Impenetrably dull." Pope.

Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air. -- Im*per"me*a*ble*ness, n. -- Im*per"me*a*bly, adv.

Not pervious; impervious. [R.] -- Im*per"vi*a*ble*ness, n. [R.]

with on or upon. The cause of reflection is not the impinging of light on the solid or impervious parts of bodies. Sir I. Newton. But, in the present order of things, not to be employed without impinging on God's justice. Bp. Warburton.

Impervious to heat; adiathermic.

Permitting liquids to pass by percolation; not capable of retaining water; porous; pervious; -- said of gravelly or sandy soils, and the like.

The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.

Impervious to the rays of light; not transparent; as, an opaque substance.

The state or quality of being impervious to light; opacity. Dr. H. More.

To render impervious, as by filling or surrounding with suitable material, or to fit or adjust so as to move without giving passage to air, water, or steam; as, to pack a joint; to pack the piston of a steam engine.

A substance or piece used to make a joint impervious; as: