e·lec·tro·en·ceph·a·lo·graph (ĭ-lěk'trō-ěn-sěf'ə-lə-grāf') n.
Abbr. EEG An instrument that measures electrical potentials on the scalp and generates a record of the electrical activity of the brain. Also called encephalograph. e·lec'tro·en·ceph'a·lo·graph'ic adj., e·lec'tro·en·ceph'a·log'ra·phy (-lŏg'rə-fē) n.
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.