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Dictionary

im•per•me•a•ble

Pronunciation: (im-pûr'mē-u-bul), [key]
—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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

impermanent

impermissible

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