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From Biology-Online Dictionary
(Science: unit) The unit of weight in the metric system. It was intended to be exactly, and is very nearly, equivalent to the weight in a vacuum of one cubic centimeter of pure water at its maximum density. It is equal to 15.432 grains. See grain.
(Science: physics) gram degree, or gramme degree, a unit of heat, being the amount of heat necessary to raise the temperature of one gram of pure water one degree Centigrade.
(Science: physics) gram equivalent, that quantity of the metal which will replace one gram of hydrogen.
Origin: f. Gramme, from gr. ? that which is written, a letter, a small weight, fr. ? To write. See graphic.