follow Dictionary.com

What is the X in X-mas?

porous

[pawr-uh s, pohr-] /ˈpɔr əs, ˈpoʊr-/
adjective
1.
full of pores.
2.
permeable by water, air, etc.
Origin
1350-1400
1350-1400; Middle English, variant of porose < Medieval Latin porōsus. See pore2, -ous
Related forms
porously, adverb
porousness, noun
nonporous, adjective
nonporousness, noun
unporous, adjective
unporousness, noun
Synonyms
2. penetrable, pervious, sievelike, riddled.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for nonporous

nonporous

/nɒnˈpɔːrəs/
adjective
1.
not permeable to water, air, or other fluids

porous

/ˈpɔːrəs/
adjective
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
Derived Forms
porously, adverb
porousness, noun
Word Origin
C14: from Medieval Latin porōsus, from Late Latin poruspore²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for nonporous

porous

adj.

late 14c., "full of pores," from Old French poros (14c., Modern French poreux), from Medieval Latin porosus; or directly from Latin porus "an opening" (see pore (n.)). Figurative use from 1640s.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
nonporous in Medicine

porous po·rous (pôr'əs)
adj.

  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.
Cite This Source
nonporous in Science
porous
  (pôr'əs)   
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.
Cite This Source

Word of the Day

Difficulty index for porous

Most English speakers likely know this word

Word Value for nonporous

11
15
Scrabble Words With Friends

Nearby words for nonporous