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.
milligram
One-thousandth of a gram.
misogrammar (s) (noun), misogrammars (pl)
The intense hatred of having to learn grammar or similar subjects: Some students in school certainly are misogrammars, since some of them never take their foreign language textbooks home with them, not doing their homework, or avoiding the study of any of the vocabulary words or sentence structures of the language.
misogrammatist (s) (noun), misogrammatists (pl)
Anyone who hates having to learn letters, grammar (structures of language) or having to study anything of a similar nature: Holly’s favorite subject at school was art and she was very talented in it; so, when she was allowed to, she dropped German, knowing that she, as a misogrammatist, was very poor at memorizing certain verb forms, adjective endings, pronunciations, etc. in this language.
monogram
Two or more letters, as initials, formed into a design to be placed on clothing, notepaper, etc., or as a crest.
monogrammatic
A reference to a design composed of one or more letters, typically the initials of a name, used as an identifying mark.
morphographic map, physiographic diagram, landform map
A small-scale map showing landforms by the systematic application of a standardized set of simplified pictorial symbols that represent the appearance such forms would have if viewed obliquely from the air at an angle of about 45°.
myogram
A graphical recording of muscle activity.
myriagram (s) (noun), myriagrams (pl)
A unit of measure equivalent to 10,000 grams or ten kilograms.
nanogram
1. One-billionth of a gram (10-9 g).
2. One billionth (1/1,000,000,000) gram: NG.
nephelogram
A photograph of a cloud.
nephogram
A photograph of a cloud.
nephrogram
Radiographic examination of the kidney after an intravenous injection of a water-soluble iodinated contrast material; also, the diffuse opacification of the renal parenchyma following such an injection, an indication of renal blood flow and glomerular filtration.

A persistent nephrogram indicates obstruction of kidney drainage.

odontogram
A personal record of bite forms of teeth used as personal identification.
one-time programmable tag
Also called a field-programmable tag.

An RFID tag that can be written to once and read many times (see WORM).

onychogram
A recording of the nail pulse and capillary circulation.

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