— impermeability, impermeableness , n. — impermeably , adv.
/im perr"mee euh beuhl/ , adj.
1. not permeable; impassable.
2. Chem. , Geol. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc.
[ 1690-1700; impermeabilis. See IM- 2 , PERMEABLE ]