gram-, -gram-, -gram, -grammatic, -grammatical, -grammatically, -gramme, -grammic +
(Greek: write, writing, something written, a written record, a recording; letters; words; later, a small weight, a unit of mass in the metric system)
A unit of weight in the metric system from 1797 gramme, borrowing of French gramme, from Late Latin gramma, "small weight"; from Greek gramma, "small weight"; originally, "something written"; from the stem of graphein, "to draw, to write".
Related "writing" word units:
glypto-;
graph-;
scrib-, script-.