Adjective porous has 3 senses
  1. porous - able to absorb fluids; "the partly porous walls of our digestive system"; "compacting the soil to make it less porous"
    Antonym:
    impermeable (indirect, via permeable)
  2. porous, poriferous - full of pores or vessels or holes
    Antonym: nonporous
  3. holey, porous - allowing passage in and out; "our unfenced and largely unpoliced border inevitably has been very porous"
    Antonym: tight (indirect, via leaky)
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