WordWeb Online

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

See also: leaky, permeable, porose

Antonym: nonporous

Encyclopedia: Porous