neurofibroma Syllabification: (neu·ro·fi·bro·ma)Pronunciation: /ˌn(y)o͝orōfīˈbrōmə/Definition of neurofibroma noun (plural neurofibromas or neurofibromata /-mətə/) Medicine a tumor formed on a nerve cell sheath, frequently symptomless but occasionally malignant. neurofibroma in other Oxford dictionaries Definition of neurofibroma in the British & World English dictionary