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1979 Jrnl. Materials Sci. 14 240/1 For ease of description we have called these types of nitridation-induced porosity micro-pores, nano-pores, and pico-pores in order of their decreasing size.

1999 New Scientist 16 Oct. 41/3 To make a real gene sequence, one that unzips DNA by dragging it through a hole, much tougher nanopores are needed.

2008 Sci. Amer. (U.K. ed.) Aug. 73/1 The silica layers had created a vast warren of nanopores, forming a sponge that soaked up any surface water instantly.