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.
unipolar electrocardiogram
1. An electrocardiogram taken with the exploring electrode placed on the chest over the heart or upon a single limb, the indifferent ("zero" potential) electrode being the central terminal.
2. An electrocardiogram that shows the potential detected by a single electrode.

In practice, this is obtained by using an exploring electrode and a second electrode; such as, a central terminal that is assumed to have zero potential.

A radiography of the ureter (either of the long, narrow tubes conveying the urine from the pelvis of each kidney to the urinary bladder) after the injection of a radiopague substance, usually through a ureteral catheter.
A radiographic visualization of the urethra (canal through which the urine is discharged) by the use of a contrast medium.
A record of urinary elimination in graphic form.
1. An x-ray picture of the urinary tract or a part of it.
2. A radiograph, or radiographic visualization, of the urinary tract made after intravenous or retrograde injection of an opaque contrast medium.
A radiogram of the vagina.
vectorcardiogram (s) (noun), vectorcardiograms (pl)
The graphic record, usually a photograph, of the direction and magnitude of the electrical forces of the heart's movements: The cardiologist, Dr. Hendricks, studied the vectorcardiogram which was supplied by Susan, the medical technician, during the patient's examination.
A radiogram of a vein after injection of a contrast medium.
A radiograph of the seminal vesicles.
The graphic record of the vibrations of the heart as recorded on the chest wall.
1. A prerecorded video recording.
2. A commercial video film or disc.
An old term that refers to a battery that produces constant voltage.
Radiography using a specially coated charged plate instead of x-ray film, developing with a dry powder rather than liquid chemicals, and transferring the powder image onto paper for a permanent record.
A xeroradiographic (a rapid method of recording a roentgen image with a dry process) depiction of the breast.
yoctogram, yg
The metric unit of 1.7 yg is equal to the mass of a proton or neutron.

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