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

noun, plural po·ros·i·ties 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for porosity

Historical Examples of porosity

British Dictionary definitions for porosity


noun plural -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 for porosity

C14: from Medieval Latin porōsitās, 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

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

porosity in Medicine


[pə-rŏsĭ-tē, pô-]


The state or property of being porous.
A structure or part that is porous.
A cavity or perforation.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

porosity in Science


[pə-rŏsĭ-tē, pô-]

The condition of being porous.
The ratio of the volume of all the pores in a material to the volume of the whole.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.