From Longman Dictionary of Contemporary Englishelectroencephalographe‧lec‧tro‧en‧ceph‧a‧lo‧graph /ɪˌlektrəʊɪnˈsefələɡrɑːf, -trəʊen- $ -troʊɪnˈsefələɡræf, -troʊen-/ noun [countable]  x-ref technical an EEG(1)
                                                    
                                                Examples from the Corpus
electroencephalograph• Who in their right mind would hook up Jell-O to an electroencephalograph.? 
