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Webster 1913 Edition

Impervious

Im-per′vi-ous

,
Adj.
[L.
impervius
; pref.
im-
not +
per
through +
via
way. See
Voyage
.]
Not pervious; not admitting of entrance or passage through;
as, a substance
impervious
to water or air
.
This gulf impassable,
impervious
.
Milton.
–
Im-per′vi-ous-ly
,
adv.
–
Im-per′vi-ous-ness
,
Noun.

Webster 1828 Edition

Impervious

IMPER'VIOUS

,
Adj.
[L. impervius; in and pervius, passable; per and via, way.]
1.
Not to be penetrated or passed through; impenetrable; as an impervious gulf; an impervious forest.
2.
Not penetrable; not to be pierced by a pointed instrument; as an impervious shield.
3.
Not penetrable by light; not permeable to fluids. Glass is pervious to light, but impervious to water. Paper is impervious to light. In the latter sense only, impervious is synonymous with impermeable.

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