A nanoparticle is a small particle that is smaller than a billionth of a meter. They are often used in medicine and science to study the effects of chemicals and radiation.

    Definition of nanoparticle


    Any microscopic particle less than about 100 nanometers (nm) in diameter. In aerosol science, the term is often reserved for particles less than 50 nm in diameter; the term "ultrafine particles" is used for particles less than 100 nm in diameter.

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