mag·ne·to·en·ceph·a·lo·gram 
(măg-nē′tō-ĕn-sĕfə-lə-grăm′)
(măg-nē′tō-ĕn-sĕfə-lə-grăm′)n. Abbr. MEG
1. A graphic record of the magnetic activity of the brain as recorded by magnetoencephalography.
2. A procedure performed to produce such a record.