Definition of: electromyograph

(i·lek′trō·mī′ə·graf, -gräf) noun Med.
An instrument for determining the location and extent of nerve lesions by the application of an electric stimulus to muscles whose responses are converted into both sound and visual records.
—e·lec′tro·my·og′ra·phy (-mī·og′rə·fē) noun e·lec′tro·my′o·graph′i·cal adjective