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".

—Compiled from information located in;
The Barnhart Dictionary of Etymology; Robert K. Barnhart, Editor;
The H.W. Wilson Company; New York; 1988; page 445.
yoctogram, yg
The metric unit of 1.7 yg is equal to the mass of a proton or neutron.
yottagram, Yg
1. One yottagram, approximately the "mass of water in the Pacific Ocean".
2. Mass of earth equal to about 6 000 yottagram.
— Source for this and other yotta words: Chemistry and Molecular Biology Resources,
UC Extension, Berkeley/San Francisco
zymogram (s) (noun), zymograms (pl)
An electrophoretic graph of the separation of enzymes in a solution: A zymogram analysis was completed regarding complex proteins released in the digestive system which catalysed the breakdown of fats and fatty acids which could then be absorbed into the bloodstream.

Related "writing" word units: glypto-; graph-; scrib-, script-.