en·ceph·a·lo·phone \ ̷ ̷ˈ ̷ ̷ ̷ ̷ ̷ ̷+ˌfōn\noun (-s) Etymology:encephal- + -phone : an apparatus that emits a continuous hum whose pitch is changed by interference of brain waves transmitted through oscillators from electrodes attached to the scalp and that is used to diagnose abnormal brain functioning