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.
heuristic program (s) (noun), heuristic programs
In computer programming, a program that provides the framework for a trial-and-error approach to problem solving, based on guesses of likely solutions.
hexagram
A figure formed by two intersecting equilateral triangles, each side of the one being parallel to a side of the other, and the six angular points coinciding with those of a hexagon.
hierogram
1. A sacred symbol or character; a hieroglyph (literally and figuratively).
2. A form of sacred or hieratic writing; an emblem, pictograph, or the like.
hierogrammat
A writer of hierograms (sacred symbols).
hierogrammate
A writer of sacred records; specifically, of hieroglyphics.
hierogrammatic
1. Written in, or pertaining to, hierograms; expressive of sacred writing.
2. Of the nature of a hierogram, relating to or consisting of hierograms or writings about religion.
hierogrammatical
1. Belonging to or relating to sacred or religious writing.
2. Written in, or referring to, hierograms; that is, expressive of sacred writing.
hierogrammatist
A writer of hierograms (sacred symbols); also, one skilled in hieroglyphics.
histogram
1. A graph showing frequency distributions.
2. A graphic representation of a frequency distribution by means of a set of rectangles, the base of each representing a class-interval and the area being proportional to the frequency of that class.
3. A bar graph of a frequency distribution in which the widths of the bars are proportional to the classes into which the variable has been divided and the heights of the bars are proportional to the class frequencies.
hologram
1. A three-dimensional image produced by wavefront reconstruction and recorded on a photographic plate.
2. A pattern produced when light (or other radiation) reflected, diffracted, or transmitted by an object placed in a coherent beam is allowed to interfere with an undiffracted background or reference beam related in phase to the first (or identical with it); a photographic plate or film containing such a pattern.
hydroseismogram
Hydroseism (fluctuations in wells, streams, lakes, ponds, and reservoirs) recorded at an expanded time scale.
hysterogram
1. An x-ray examination of the uterus, usually using a contrast medium.
2. A recording of the strength of uterine contractions.
ichnogram
The imprint of the soles of the feet, taken while standing.
ideogram
1. A symbol used in some writing systems, e.g., those of Japan and China, that directly but abstractly represents the thing or concept itself rather than the word for it.
2. A symbol or graphic character; such as, @ or &, and Arabic numerals: 1, 2, 3, etc.
ideogrammatic
1. Referring to a symbol used in some writing systems; such as, those of Japan and China, that directly but abstractly represents a thing or concept itself rather than the word for it.
2. Characterized by a symbol, or graphic character, used to represent a word; for example, "@" or "&".

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