[paw-ros-i-tee, poh-, puh-]
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.

1350–1400; Middle English porosytee < Medieval Latin porōsitās. See porous, -ity

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World English Dictionary
porosity (pɔːˈrɒsɪtɪ)
n , pl -ties
1.  the state or condition of being porous
2.  geology the ratio of the volume of space to the total volume of a rock
[C14: from Medieval Latin porōsitās, from Late Latin poruspore²]

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
porosity   (pə-rŏs'ĭ-tē, pô-)  Pronunciation Key 
  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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Example sentences
It's porosity leaves it open to staining, and its softness makes it vulnerable to scratches and abrasion.
But their operation is relative and according to the porosity of the body to which they are applied.
Thin sections will allow us to look at the porosity and microstructure of the eggshell.
Porosity can vary within parts as well, leading to concerns about fatigue or brittleness.
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