ultrastructure
noun
- the nanostructure of a biological specimen that can be viewed with ultramicroscopy or electron microscopy
Wiktionary
noun
Etymology: Etymology tree English ultra- English structure English ultrastructure From ultra- + structure.
- The fine, detailed structure of a biological specimen that can only be observed by electron microscopy
“The mucus film has a mesh-like ultrastructure that can trap particles as small as 0.1 μm.”