An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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trace element
  بن‌پار ِ مله  
bonpâr-e malé
Fr.: élément trace, oligo-élément  

Any → chemical element that is found in extremely small amounts, especially one used by organisms and held essential to maintain proper physical functioning.

See also: → trace; → element.