porosity

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

po·ros·i·ty

[paw-ros-i-tee, poh-, puh-]
noun, plural po·ros·i·ties for 2.
1.
the state or quality of being porous.
2.
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:
1350–1400; Middle English porosytee < Medieval Latin porōsitās. See porous, -ity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Porosity is always a great word to know.
So is horizon. Does it mean:
portion of the earth's surface consisting of disintegrated rock and humus
thin, distinctive stratum useful for stratigraphic correlation
Collins
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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

  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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