What does "gram" mean?

Additional senses

1. 2.The East Indian name of the chick-pea (Cicer arietinum) and its seeds; also, other similar seeds there used for food.
2. 3.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, n., 4. Gram degree, or Gramme degree (Physics), a unit of heat, being the amount of heat necessary to raise the temperature of one gram of pure water one degree centigrade. -- Gram equivalent (Electrolysis), that quantity of the metal which will replace one gram of hydrogen.