electroencephalogram
‘a graphic record of the electrical activity of the brain as recorded by an electroencephalograph’
Lexical development traced from the Tamil root:
E. electrencephalogram, electrenkephalogram, electroencephalogram < Gk. ēlektro- < ēlektron ‘amber, also shining metal’ + -encephalo- + -gram < uhlektroh < arg- < Tamil ar.