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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.

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.

eing 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.

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:

weaker seek. Milton. O death, made proud with pure and princely beauty ! Shak. And shades impervious to the proud world's glare. Keble.

Clay, or a mixture of clay and sand, kneaded or worked, when wet, to render it impervious to water. Puddle poet, a low or worthless poet. [R.] Fuller.

process of working clay, loam, pulverized ore, etc., with water, to render it compact, or impervious to liquids; also, the process of rendering anything impervious to liquids by means of puddled material.

Impervious to the light of the stars; as, a starproof elm. [Poetic] Milton.

To render impervious or solid by driving with a calking iron; as, to stave lead, or the joints of pipes into which lead has been run. To stave and tail, in bear baiting, (to stave) to interpose with the staff, doubtless to stop the bear; (to tail) to hold back the dog by the tail. Nares.