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permeable vs. impermeable

[ pur-mee-uh-buhl ]
adjective
  1. capable of being permeated.
[ im-pur-mee-uh-buhl ]
adjective
  1. not permeable; impassable.
  2. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc.