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Definition of g (gram)
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
g (gram): Symbol for gram, a unit of measurement of weight and mass in the metric system. In weight, a gram is equal to a thousandth of a kilogram. In mass, a gram is equal to a thousandth of a liter (one cubic centimeter) of water at 4 degrees centigrade.
The word "gram" comes from the Late Latin "gramma" meaning a small weight via the French "gramme." The abbreviation for gram is gm.