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Webster 1913 Edition

Noun.

The quality of being porous.

The open parts; the interstices of anything.

[R.]

They will forcibly get into the

porousness

of it.

Sir K. Digby.

Noun.

The quality of having pores, porosity; as the porousness of the skin of an animal, or of wood, or of fossils.

The porous parts. [Not authorized.]

porousness ‎(usually uncountable, plural porousnesses)