electrohysterograph

noun

elec·​tro·​hys·​tero·​graph i-ˌlek-trə-ˈhis-tə-rə-ˌgraf 

: an instrument for recording electrical activity in the contracting uterine muscle during labor that is used especially to detect abnormal labor

electrohysterography

-ˌhis-tə-ˈräg-rə-fē 

noun

plural electrohysterographies