'neurilemmal' originates from English, specifically from the word 'neurilemma' with the adjectival suffix '-al', where '-al' meant 'pertaining to'.

'neurilemmal' changed from the Modern Latin/English medical term 'neurilemma' (itself from Greek elements) and eventually became the English adjective 'neurilemmal' by adding '-al' to form a word meaning 'relating to the neurilemma'.

Initially, the root term meant 'nerve sheath', but over time it evolved into the adjectival sense 'relating to the nerve sheath' used in modern anatomical and histological contexts.