neurilemma Syllabification: (neu·ri·lem·ma)Pronunciation: /ˌn(y)o͝orəˈlemə/Definition of neurilemma noun (plural neurilemmas or neurilemmata /-liˈmätə/) Anatomy the thin sheath around a nerve axon (including myelin where this is present). Derivatives neurilemmal adjective neurilemma in other Oxford dictionaries Definition of neurilemma in the British & World English dictionary