gigagram

== English == === Alternative forms === gigagramme (UK) === Etymology === From giga- +‎ gram. === Noun === gigagram (plural gigagrams) (metrology) An SI unit of mass equal to 109 grams. Symbol: Gg Meronyms: picogram < nanogram < microgram < milligram < gram < kilogram < megagram ==== Synonyms ==== kilotonne