
Ultrastructure (or ultra-structure) is the nanostructure of a biological specimen, such as a cell, tissue, or organ, at scales smaller than can be viewed with light microscopy. It is viewed with ultramicroscopy or electron microscopy. Such cellular structures as organelles, which allow the cell to function properly within its specified environment...
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http://en.wikipedia.org/wiki/Ultrastructure

<pathology> General term to describe the level of organisation that is below the level of resolution of the light microscope. In practice, a shorthand term for structure observed using the electron microscope, although other techniques could give information about structure in the sub micrometre range. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(ul´trә-struk″chәr) the structure visible only under the ultramicroscope and electron microscope.
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http://www.encyclo.co.uk/local/21001

The physical and chemical structure of the amyloid or PrP. Often this includes the way in which the proteins are shaped.
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General term to describe the level of organization that is below the level of resolution of the light microscope. In practice, a shorthand term for ‘structure observed using the electron microscope`, although other techniques could give information about structure in the sub-micrometre range.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: ŭl′tră-strŭk′chūr Definitions: 1. Structures or particles seen with the electron microscope. Synonyms: fine structure
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http://www.medilexicon.com/medicaldictionary.php?t=95530

The detailed structure of a specimen, such as a cell, tissue, or organ, that can be observed only by electron microscopy. Also called fine structure.
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http://www.ucmp.berkeley.edu/glossary/glossary_4.html
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