noun, plural po·ros·i·ties for 2.
Porus is a borrowing of Greek póros “passage, ford, means, way out,” from the Proto-Indo-European root per-, por- (with other variants) “to lead, pass, pass over,” from which Latin derives portus “harbor” (from the sense “passage”) and portāre “to carry.” Proto-Indo-European por- becomes far- in Germanic, forming the verb faran “to wander,” Old English faran “to go, proceed, travel” (English fare ). From far-, Germanic also forms the verb farjan, Old English ferian “to carry, convey, transport” (English ferry ).
Both porous and porosity first appeared in a 14th-century English translation of a Latin encyclopedia of the sciences, an influential work that was written in the mid-13th century. The reference was to the tongue, described as being “porous and spongy.”
Examples from the Web for porosity
Care must be taken that no crystals appear, which would injure the porosity of the paper.Paper and Printing Recipes|J. Sawtelle Ford
It is apparent that the different weights of woods, as between cedar and oak for example, are due chiefly to porosity.American Forest Trees|Henry H. Gibson
It dissolves the cantharidin, and at the same time gives to the collodion film the essential property of porosity.
It increases the porosity of soils and permits roots to go deeper into the soil for food and moisture.Agriculture for Beginners|Charles William Burkett
Porosity is therefore the reverse of plasticity and these two properties must be adjusted so as to balance each other.The Potter's Craft|Charles F. Binns