1) Eeg 2) Electroencephalogram 3) Pneumoencephalogram 1) Electroencephalogram 2) Graph 3) Graphical record 
The record obtained by encephalography. ... Origin: encephalo-+ G. Gramma, a drawing ... (05 Mar 2000) ... 
Type: Term Pronunciation: en-sef′ă-lō-gram Definitions: 1. The record obtained by encephalography.
[n] - an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast
encephalogram The record obtained by encephalography (radiographic representation of the brain).
pneumoencephalogram noun an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast
an x-ray of the brain, usually involving replacement of some cerebrospinal fluid by air or other gas that circulates to the brain's ventricular spaces and acts as a contrast medium.