'neurilemmic' originates from New Latin/modern scientific coinage, formed from 'neurilemma' + the adjectival suffix '-ic'. 'Neurilemma' itself is built from Greek elements: 'neuron' (νεῦρον) meaning 'nerve' and 'lemma' (λῆμμα) meaning 'husk' or 'sheath'.

'neurilemmic' developed from the New Latin/modern scientific noun 'neurilemma', which was formed from Greek 'neuron' + 'lemma'; the noun entered scientific usage in anatomy/neurology and the adjective was later created with the suffix '-ic' to mean 'related to neurilemma'.

Originally the root referred to the physical 'nerve sheath' (neurilemma); over time the derived adjective has been used to describe conditions, structures, or changes 'relating to the neurilemma'.