Etymology
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electroencephalogram (n.)

1934, from electro- + encephalo-, combining form of Modern Latin encephalon "brain" (see encephalitis) + -gram.

updated on October 09, 2017

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Definitions of electroencephalogram from WordNet

electroencephalogram (n.)
a graphical record of electrical activity of the brain; produced by an electroencephalograph;
Synonyms: encephalogram / eeg
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.