Definition of "electroencephalograph" [electroencephalograph]

• An instrument that measures electrical potentials on the scalp and generates a record of the electrical activity of the brain. Also called encephalograph. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Using a new test called the electroencephalograph, the study measured the electrical activity in the brain, and sought to deduce character from the squiggles."
• "A team led by Dr Lakhmir Chawla used an electroencephalograph (EEG), a device that measures brain activity, in seven terminally ill people to provide pain-relieving sedation."
• "In 2007 the duo built a body-heat powered electroencephalograph device that monitored brain activity."