Noun
megagram (plural megagrams)
A unit of mass equal to 1,000,000 grams. Symbol: Mg
Synonyms: metric ton, tonne, MT
Conversions One tonne is equivalent to: *Metric/SI: 1 megagram (Mg) (by definition). Source: Internet
However, megagram (and gigagram, teragram, etc.) are rarely used; tonnes (and kilotonnes, megatonnes, etc.) or scientific notation are used instead. Source: Internet