electroencephalograph
noun
elec·tro·en·ceph·a·lo·graph i-ˌlek-trō-in-ˈse-f(ə-)lə-ˌgraf 
: an apparatus for detecting and recording brain waves
electroencephalographer
i-ˌlek-trō-in-ˌse-fə-ˈlä-grə-fər
noun electroencephalographic
i-ˌlek-trō-in-ˌse-f(ə-)lə-ˈgra-fik
adjective electroencephalographically
i-ˌlek-trō-in-ˌse-f(ə-)lə-ˈgra-fi-k(ə-)lē
adverb electroencephalography
i-ˌlek-trō-in-ˌse-f(ə-)lə-ˈlä-grə-fē
noun 
Word History
Etymology
International Scientific Vocabulary
First Known Use
1935, in the meaning defined above
Medical Definition
electroencephalograph
noun
elec·tro·en·ceph·a·lo·graph -ˌgraf
: an apparatus for detecting and recording brain waves
called also encephalograph