nanopore

This term is primarily used within highly specialized scientific registers, specifically in nanotechnology, biophysics, and genomics. It describes a precise structural feature rather than a general hole, implying a level of engineering or natural occurrence at the atomic scale.

In practical application, the word is most frequently associated with "nanopore sequencing," a method of analyzing DNA or RNA. Because it refers to a specific physical entity, it follows standard countability rules for hardware or biological structures.