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[paw-ros-i-tee, poh-, puh-] /pɔˈrɒs ɪ ti, poʊ-, pə-/
noun, plural porosities for 2.
the state or quality of being porous.
Geology, Engineering. the ratio, expressed as a percentage, of the volume of the pores or interstices of a substance, as a rock or rock stratum, to the total volume of the mass.
Origin of porosity
1350-1400; Middle English porosytee < Medieval Latin porōsitās. See porous, -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for porosity


noun (pl) -ties
the state or condition of being porous
(geology) the ratio of the volume of space to the total volume of a rock
Word Origin
C14: from Medieval Latin porōsitās, 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
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Word Origin and History for porosity

late 14c., from Old French porosité, from Medieval Latin porositas, from porus (see pore (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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porosity in Medicine

porosity po·ros·i·ty (pə-rŏs'ĭ-tē, pô-)

  1. The state or property of being porous.

  2. A structure or part that is porous.

  3. A cavity or perforation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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porosity in Science
  (pə-rŏs'ĭ-tē, pô-)   
  1. The condition of being porous.

  2. The ratio of the volume of all the pores in a material to the volume of the whole.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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