neurofibromaPronunciation: /ˌnjʊərə(ʊ)fʌɪˈbrəʊmə/Definition of neurofibroma noun (plural neurofibromas or neurofibromata /-mətə/) Medicine a tumour formed on a nerve cell sheath, frequently symptomless but occasionally malignant. neurofibroma in other Oxford dictionaries Definition of neurofibroma in the US English dictionary