- electroencephalogram, encephalogram, EEG - a graphical record of electrical activity of the brain; produced by an electroencephalograph
--1 is a kind of graph, graphical record
- encephalogram, pneumoencephalogram - an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast
--2 is a kind of roentgenogram, X ray, X-ray picture, X-ray photograph