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]
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