Definition of "nonporous" []

• Having no pores, not penetrable, impervious. (adjective)

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• "The EPA's letter comes amid increased scrutiny of the impact of natural gas drilling on water quality, specifically hydraulic fracturing, the technique used to cull oil and gas from shale and other nonporous rocks."
• "To start, pour a small amount of dry pigment forming a mound onto a nonporous slab surface, such as glass or marble; then, make an impression in the center of the mound and, into that, pour a small amount of linseed or other oil."
• "Like almost all of Elsheimer's paintings, this story-within-a-landscape is small, just 12¼ inches by 16¼ inches, and painted on copper, whose smooth, nonporous surface intensifies the luminosity of the oil paint, makes his colors sparkle, and sharpens his minute details."