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The Collaborative International Dictionary
Imporosity

Imporosity \Im`po*ros"i*ty\, n. [Perf. im- not + porosity: cf. F. imporosit['e].] The state or quality of being imporous; lack of porosity; compactness. ``The . . . imporosity betwixt the tangible parts.''
--Bacon.

Wiktionary
imporosity

n. The state or quality of being imporous; lack of porosity.