electrooculogram
noun
elec·tro·oc·u·lo·gram i-ˌlek-trō-ˈä-kyə-lə-ˌgram 
: a record of the difference in electrical charge between the front and back of the eye that is correlated with eyeball movement (as in REM sleep) and obtained by electrodes placed on the skin near the eye
Word History
Etymology
electr- + Latin oculus eye + English -gram — more at eye
First Known Use
1947, in the meaning defined above
Medical Definition
electrooculogram
noun
elec·tro·oc·u·lo·gram i-ˌlek-trō-ˈäk-yə-lə-ˌgram
: a record of the standing voltage between the front and back of the eye that is correlated with eyeball movement (as in REM sleep) and obtained by electrodes suitably placed on the skin near the eye