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.
grammatism
An excessively pedantic behavior (concern for book learning and formal rules) about grammatical standards and principles which is shown by a narrow focus on or a display of learning; especially, its trivial or "insignificant" aspects or those of little significance or value to others.
grammatolatrist
A strong adherence to the forms of words.
grammatolatry
The worship of letters; adherence to every letter of the Scripture.
grammatoloatry
1. The worship of letters.
2. A rigid adherence to the letter (literal meaning) of the Scriptures.
grammatologist
A specialist who studies writing systems.
grammatology
The study of writing systems.
gramophile
An enthusiast for the gramophone and gramophone records.
gramophone
An instrument for the reproduction of recorded sound, similar in principle to the phonograph but using, instead of a drum, a flat disc containing a spiral groove; a stylus is allowed to rest in the groove as the disc is rotated on a turntable, and the vibrations communicated to the stylus by the iregularities in the groove are transformed into sound vibrations.

In the U.S., phonograph is the generic name for such an instrument.

hectogram
One hundred grams, the equivalent of 1543.7 grains.
heliogram (s) (noun), heliograms (pl)
A communication transmitted on an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays on and off or a signal by means of a mirror and while using the sun's rays.
hemogram
A complete detailed record of the findings in a thorough examination of the blood, especially with reference to the numbers, proportions, and morphologic features of the formed elements.
hemotachogram
The record produced by a hemotachrometer (an apparatus used to measure the velocity of the blood).
hendecagram (s) (noun), hendecagrams (pl)
A star polygon that has eleven points.
hepatogram
A radiograph (x-ray) of the liver.
herniogram
A depiction, or an image, of a hernia made with herniography.

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