from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A semiconductor nanostructure in which the excitons are constrained in all three spatial dimensions.
  • noun A nanoscale crystal that absorbs white light and then reemits it a couple of nanoseconds later in a specific color, used in medicine as probes to track antibodies, viruses, proteins, or DNA within the human body.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A fluorescent nanoparticle of semiconducting material.


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  • "A quantum dot is a portion of matter (e.g., semiconductor) whose excitons are confined in all three spatial dimensions. Consequently, such materials have electronic properties intermediate between those of bulk semiconductors and those of discrete molecules." (Wikipedia)

    And, apparantly, you can make earthworms procuce them.

    December 30, 2012