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.
E electroretinogram
An electroretinogram which exhibits excitatory characteristics derived from the rods.
echocardiogram
1. A medical test which uses high-frequency sound waves to image the heart and surrounding tissues.
2. An image of the heart produced by ultrasonography or a test that uses sound waves to create a moving picture of the heart.

The picture is much more detailed than x-ray images and involves no radiation exposure.

echogram
1. A record made by an echo-sounder.
2. A record obtained using high frequency acoustic reflection techniques in any one of the various display modes, especially an echocardiogram.
echosonoencephalogram
A pictorial representation of intracranial structures, obtained by echoencephalography.
electrically erasable programmable read-only memory, EEPROM
1. A method of storing data on microchips.

Usually bytes can be erased and reprogrammed individually.

RFID tags that use EEPROM are more expensive than factory programmed tags, where the number is written into the silicon when the chip is made, but they offer more flexibility because the end user can write an ID number to the tag at the time the tag is going to be used.

2. A form of read-only memory which can be electrically erased and reprogrammed.
3. An integrated-circuit memory chip that has an internal switch to permit a user to erase the contents of the chip and to write new contents into it with electrical signals.
electrocardiogram, ECG, EKG; cardiogram
1. The graphic recording of the potentials of the heart detected on the surface of the body by electrocardiography.
2. A record of the electric currents produced in the body by the heart-beats of a patient. The electrocardiogram gives important information concerning the spread of excitation to the different parts of the heart, and is of value in diagnosing cases of abnormal cardiac rhythm and myocardial damage which refers to the muscular tissue of the heart.
electrocardiophonogram
The record obtained by electrocardiophonography (a method of electrically recording the heart sounds).

This record provides information about the part of the heart that triggers each heartbeat (the pacemaker), the nerve conduction pathways of the heart, and the rate and rhythm of the heart.

electrocerebellogram
A record of the electrical activity displayed by the cerebellum.

Using electrodes with suitably small contacts, it is distinguished by random, high-frequency activity.

electrocochleogram
A graphic record of the auditory threshold as measured by electrocochleography.
electroencephalogram, EEG
1. The record obtained by means of the electroencephalograph which presents a record of electric currents generated in the cortex of the active brain.
2. A technique for studying the electrical currents within the brain.

Electrodes are attached to the scalp and wires attach these electrodes to a machine, which records the electrical impulses.

The results are either printed out or displayed on a computer screen where different patterns of electrical impulses can indicate various forms of epilepsy.

3. A graphic record of the minute changes in electric potential associated with the activity of the cerebral cortex, as detected by electrodes applied to the surface of the scalp.
4. A graphic chart on which is traced the electric potential produced by the brain cells, as detected by electrodes placed on the scalp.

The resulting brain waves are called alpha, beta, delta, and theta rhythms; according to the frequencies they produce, which range from two to twelve cycles per second.

Variations in brain wave activity are correlated with neurological conditions, psychological states, and levels of consciousness.

electrogastrogram
1. A study in which the electrical current generated by the muscles of the stomach are sensed and recorded.
2. A test in which the electrical current generated by the muscles of the stomach are sensed and recorded in a manner very similar to that of an electrocardiogram of the heart.

An electrogastrogram is performed by taping electrodes to the skin on the upper abdomen over the stomach.

Recordings from the muscles are stored and analyzed by a computer and the electrogastrogram is performed in order to diagnose motility disorders of the stomach, conditions which prevent the muscles of the stomach from working normally.

electrogram
1. Any record on paper or film made by an electrical event.
2. A record of changes in electrical activities or time variations in the atmospheric electric field for a given point.
3. A unipolar or bipolar record of the electric activity of the heart as recorded by electrodes within the cardiac chambers or on the epicardium; such as, the atrial electrogram, and the ventricular electrogram.
4. The graphic representation of electric events in living tissues; most commonly, an electrocardiogram or electroencephalogram.
electrohysterogram
1. A recording of uterine electrical activities.
2. A record of the electrical activity of the uterine muscular contractions.
electrokymogram, EKY
A technique for making a graphic record of the heart's movements produced by the electrokymograph (device that records changes in the density of the body part which is being examined) or the record produced by electrokymography (record of the motion of the borders of bodily organs).
electrolaryngogram, laryngogram, glottogram
The oscilloscopic record (electronic device used to produce visual displays corresponding to electrical signals) of vocal cord activities made by means of electrolaryngography (recording of the activity of the vocal cords).

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