The American Heritage® Dictionary of the English Language, 4th Edition
n. An instrument that measures electrical potentials on the scalp and generates a record of the electrical activity of the brain. Also called encephalograph.
n. An instrument used for recording of electrical brain activity.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. medical instrument that records electric currents generated by the brain
Word Usage
"Using a new test called the electroencephalograph, the study measured the electrical activity in the brain, and sought to deduce character from the squiggles."