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From The Collaborative International Dictionary of English v.0.48:
Porous \Por"ous\, a. [Cf. F. poreux. See Pore, n.] Full of pores; having interstices in the skin or in the substance of the body; having spiracles or passages for fluids; permeable by liquids; as, a porous skin; porous wood. "The veins of porous earth." --Milton. [1913 Webster]