» For other uses of the words gram or gramme, see gram (disambiguation). The gram (sometimes gramme in British English, although gram prevails), (Greek/Latin root grámma); symbol g, is a unit of mass. Originally defined as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre, and at the temperature of melting ice" (later 4 °C), a gram is now defined as one one-thousandth of the SI base unit, the kilogram, or 1×10-3 kg, which its… (More on Gram)