[pawr-uhs, pohr-]
full of pores.
permeable by water, air, etc.

1350–1400; Middle English, variant of porose < Medieval Latin porōsus. See pore2, -ous

porously, adverb
porousness, noun
nonporous, adjective
nonporousness, noun
unporous, adjective
unporousness, noun

2. penetrable, pervious, sievelike, riddled.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
porous (ˈpɔːrəs)
1.  permeable to water, air, or other fluids
2.  biology, geology having pores; poriferous
3.  easy to cross or penetrate: the porous border into Thailand; the most porous defence in the league
[C14: from Medieval Latin porōsus, from Late Latin poruspore²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., "full of pores," from M.Fr. poreux (14c.), M.L. porosus, from L. porus "opening" (see pore (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

porous po·rous (pôr'əs)

  1. Full of or having pores.

  2. Admitting the passage of gas or liquid through pores.

po'rous·ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
porous   (pôr'əs)  Pronunciation Key 
Having many pores or other small spaces that can hold a gas or liquid or allow it to pass through.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Don't even try to close the holes in a country, and a society, designed to be
Many parts of the ecoregion have such porous soil that rainfall passes right
Compost requires oxygen to decompose, so you need some kind of open, porous
On another note, she climbed under or over my porous fence twice today, the
  first time in several months.
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