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.
e·lec·tro·en·ceph·a·lo·gram (ĭ-lěk'trō-ěn-sěf'ə-lə-grām') n.
Abbr. EEG A graphic record of the electrical activity of the brain as recorded by an electroencephalograph. Also called encephalogram.
en·ceph·a·lo·gram (ěn-sěf'ə-lə-grām', -ə-lō-) n.
An x-ray picture of the brain taken by encephalography. Also called encephalograph.