imperviousness
[f. as prec. + -ness.]
The quality of being impervious; impenetrability.
| 1727 in Bailey vol. II. (Hence in Johnson, etc.) 1869 Tyndall Notes Lect. Light §137 To a similar cause is due the whiteness and imperviousness of common salt, and of transparent bodies generally when crushed to powder. 1896 Duke of Argyll Philos. Belief 77 A modification of the same substance supplies imperviousness to the passage of air. |