[ pawr-uhs, pohr- ]
/ ˈpɔr əs, ˈpoʊr- /


full of pores.
permeable by water, air, etc.

Origin of porous

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


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for porous

British Dictionary definitions for porous

/ (ˈpɔːrəs) /


permeable to water, air, or other fluids
biology geology having pores; poriferous
easy to cross or penetratethe porous border into Thailand; the most porous defence in the league

Derived forms of porous

porously, adverbporousness, noun

Word Origin for porous

C14: from Medieval Latin porōsus, from Late Latin porus pore ²
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

Medical definitions for porous

[ pôrəs ]


Full of or having pores.
Admitting the passage of gas or liquid through pores.

Other words from porous

porous•ness n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for porous

[ pôrəs ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.