Usually means: Extremely small unit of mass.
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We found 4 dictionaries that define the word attogram:

General (2 matching dictionaries)
  1. attogram: Wiktionary
  2. Attogram: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Attogram: Encyclopedia

Medicine (1 matching dictionary)
  1. Attogram: Medical dictionary

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Definitions from Wiktionary (attogram)

▸ noun:  (metrology) An SI unit of mass equal to 10⁻¹⁸ grams. Symbol: ag

Similar:
rontogram, nanogram, zettagram, picogram, attometer, attometre, microgram, atto-meter, milligram, microgramme, more...

Opposite:
petagram, teragram, gigagram, megagram

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Similar:
rontogram, nanogram, zettagram, picogram, attometer, attometre, microgram, atto-meter, milligram, microgramme, more...

Opposite:
petagram, teragram, gigagram, megagram



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