ultrastructure

/ˌʌltrəˈstrʌktʃər/
noun
  1. The fine structure of a biological specimen, visible only with an electron microscope.
    • The textbook includes diagrams of the ultrastructure of a chloroplast.
    • Advances in microscopy have allowed us to explore the ultrastructure of viruses.
    • The ultrastructure of the nerve cell shows how signals are transmitted.
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