WordWeb Online

1. Able to absorb fluids
   "the partly porous walls of our digestive system"; "compacting the soil to make it less porous"
    
2. Full of pores or vessels or holes
   - poriferous
    
3. Allowing passage in and out
   "our unfenced and largely unpoliced border inevitably has been very porous"
   - holey

See also: leaky, permeable, pore, porose, porosity

Antonym: nonporous

Encyclopedia: Porous